# Falcon is a sensor + cloud verdict factory. Event, policy, then RTR. Source: https://ai.techclick.in/blog_crowdstrike_session_factory Markdown: https://ai.techclick.in/blog_crowdstrike_session_factory.md Publisher: Techclick Infosec Pvt Ltd Falcon is a sensor + cloud verdict factory: sensor → event → detection/prevention policy → cloud verdict → RTR. Official CrowdStrike docs only. Quick answer CrowdStrike Falcon is a sensor + cloud verdict factory . The lightweight sensor on the host observes process, file and network activity and prints an event . That event walks the assigned detection / prevention policy (and any custom IOA). The Falcon cloud writes the verdict — Detect, Prevent, tactic, technique, severity. Real Time Response is how you act on a live host after the ticket exists. Success is last_seen in seconds, the assigned policy named, a Detection you can quote, and an RTR session that actually opened — not “the icon is green.” Say this out loud I do not start with the filename. I ask whether the sensor checked in, which prevention policy that AID inherited, whether the slider said Detect or Prevent, what tactic the cloud wrote, and whether RTR can open. A Detect stamp is not a miss. A dark sensor cannot take a contain or an RTR command. ## 1. Why a green tray is not a verdict Every other briefing starts with the filename. lsass.bin . “Falcon missed it.” That is why students freeze in interviews. The real object is the event the sensor printed . Features are only stamps the factory puts on that event before the cloud names a verdict. Official CrowdStrike architecture: a single lightweight sensor on the endpoint, a 100% cloud console, and the CrowdStrike Security Cloud (Threat Graph) that turns those events into detections and preventions. The sensor keeps protecting when the host is offline. The console only knows what the sensor last uploaded. Official Hosts field: last_seen is the most recent connection to Falcon, in UTC. Hours old is a dark factory floor. Seconds old is a live worker. Hero · the factory floor Notice: Falcon does not “miss a file.” It tries to manufacture an event, stamp it with policy, and write a cloud verdict. #### What the ticket asked “Falcon missed LSASS.” That sentence is a hypothesis. The factory may already have Detect-stamped the event and printed a live ticket you have not opened. #### What you prove first Identity of the AID, then last_seen , then the assigned Prevention policy, then the Detection tactic. The evidence desk is the night-shift version of this order. The lie every L1 repeats “The tray icon is green, so Falcon is working — we need a wider exclude.” A green icon only means a sensor process is running on that laptop. If last_seen is four days old, or the assigned slider is Detect, or the host is in Reduced Functionality Mode, the factory did not print the ticket you think it printed. Widening an exclude just stamps more events as invisible. ### Hard words before the runbook #### Sensor / AID The Falcon sensor on the host. device_id is the agent ID (AID). One hostname can have two AIDs after a reimage. Official Hosts filters: hostname , device_id , agent_version . #### Event What the sensor observed: process create, file write, network connect, script. Events go to the Falcon cloud. Later events of the same process tree ride the same story. #### Prevention policy Assigned to a host group. Each setting is some form of Detect or Prevent. Official API: enable / disable, add-host-group, precedence. A Detect slider is configuration, not a miss. #### Cloud verdict The Detection / Alert the cloud writes: tactic , technique , severity , status . IOA is behavior. IOC is a hash. Falcon’s word for cutting the rest of the network is contain , not isolate. Official Hosts containment values: normal , containment_pending , contained , lift_containment_pending . Official RFM field: reduced_functionality_mode is yes or no . Official RTR: a session must be initialized; it expires after 5 minutes unless refreshed. Use those words in the ticket. ## 2. Mental model — five factory stations Hold five parts. Interviews fail when people mix them. Skipping a station is how you contain a stale AID or argue an IOA on a host that has not checked in since Monday. #### 1. The worker is the sensor One lightweight agent. It sees the host. last_seen is the heartbeat. RFM means the worker is injured — limited telemetry, limited prevention. A green tray is not last_seen . #### 2. The ticket is the event Process create, file write, network. The first event of a new process is setup. Later events of the same tree ride that story. No event = nothing for policy to stamp. #### 3. The stamps are policy + IOA Prevention policy = Detect or Prevent for that host group. Custom IOA = your own behavior rule with an action label. IOA exclusion = do not stamp this pattern. Hash IOCs are a different stamp. #### 4. The verdict is the cloud Threat Graph + ML + IOA name the behavior. Official Alert fields: tactic , technique , severity , status . That is the finished ticket. Empty Detections is usually a dark sensor, not a silent miss. Path · first event vs later events Notice: the diamond is not “did Falcon miss it?” It is “did this AID print an event the cloud could stamp?” Flow 1 · one ticket, five stations Falcon factory: sensor prints event, policy stamps Detect or Prevent, cloud writes verdict, RTR acts - DEVICE-LAB-17 · aid-lab-17-live · last_seen 22s 1 Sensor Host management last_seen · RFM device_id = AID dark = no ticket 2 Event process / file / net first event = setup later events ride tree no event = no stamp 3 Policy Detect or Prevent host-group assign custom IOA action Detect ≠ miss 4 Cloud verdict tactic · technique severity · status Activity → Detections empty ≠ silent miss 5 RTR init session ps · ls · get expires in 5 min needs last_seen Policy stamp Detect lets it run Prevent stops it IOA stamp behavior, not hash action_label Detect/Prevent Contain is a network stamp not isolate · cloud channel stays normal → containment_pending → contained Duplicate AID check lives inside station 1. Sort last_seen. Work the live sensor. Host management is the live table. Detections are history. RTR is the live host. Commit of a slider is a recipe, not a verdict. Read left → right. Station 1 is last_seen plus AID. RTR is last, and only on a live host. Contain is a network stamp, not a replacement for RTR. Concept: Falcon manufactures events on a sensor and writes verdicts in the cloud. Path: sensor → event → policy stamp → cloud verdict → RTR. Do: never open the filename first. Sensor answers “is this AID talking?” Official: last_seen , agent_version , reduced_functionality_mode , status . Source: Hosts API — QueryDevicesByFilter. Policy answers “was this host allowed to block?” Official: Prevention policies are assigned to host groups, have precedence, and can be enabled or disabled. Custom IOA rules carry an action_label . Source: Prevention Policy API + Custom IOA API. Cloud verdict answers “what behavior did the factory name?” Official Alert fields: tactic , technique , severity , status . IOA is the behavior story. IOC is a hash. Source: Alerts API + CrowdStrike IOA vs IOC. RTR answers “what is on this live host right now?” Official: initialize a session, then run commands. Sessions expire after 5 minutes unless refreshed. A dark host queues; it does not collect. Source: Real Time Response API. ## 3. First event vs later events of the tree The first event of a new process has no verdict yet. It walks the factory: sensor observes → event is printed → assigned policy + IOA stamp Detect or Prevent → cloud names tactic / technique. Later events of the same process tree ride that story. That is why “I moved the slider” sometimes does nothing until the next new process, and why “I contained the leftover AID” does nothing to the laptop on the desk. Flow 2 · official factory order (student labels) Falcon first-event factory path versus later events of the same process tree Sensor → last_seen? → print event → policy stamp → cloud verdict → RTR 1 Sensor observe host last_seen? seconds? yes SETUP — first event of this process tree print ticket · stamp policy · wait for cloud verdict Print event proc / file / net Policy lookup host-group assign Detect or Prevent? Cloud verdict tactic · technique RTR / contain only if last_seen live Hours old sensor ticket LATER EVENTS — same process tree, same AID more telemetry on the existing story · policy already stamped · Detection may update · RTR still needs a live session Official facts students invert 1. last_seen is UTC check-in, not a tray icon. Hours old = RTR and contain sit pending. 2. Prevention policy is assigned to a host group and has precedence. Read the assigned policy, not the default. 3. Detect writes a verdict and lets the process run. Prevent writes a verdict and stops it. Both are stamps. 4. RTR sessions expire after 5 minutes unless refreshed. Init the session before ps / ls / get. 5. Falcon contains (status contained). It does not isolate. Cloud + containment-policy IPs stay reachable. Source: Hosts API · Prevention Policy API · Real Time Response API · CrowdStrike EDR / IOA pages RFM = reduced_functionality_mode yes. Duplicate hostname = two device_id values. Sort last_seen. Read left → right, then the green later-events bar. Decision diamond = “is last_seen seconds?” Detect vs Prevent sits on the live branch only. #1 student trap — Detect called a miss The first events of a living-off-the-land chain are still just process creates. The factory may write a Detection with action Detect and leave the process running. That is the assigned Prevention policy doing what you configured. Official: policy settings control detection and blocking behavior; custom IOA rules carry an action_label . If the slider is Detect, promoting it or containing the host is a change — writing “Falcon missed it” is a lie. ## 4. How to choose the stamps You are not choosing a product. You are choosing what the factory is allowed to write on the event. Choice Use when Do not use when Proof you were right Prevent on the assigned policy Production host groups that must stop known IOA / ML / ransomware classes. A detect-only pilot you have not finished. Promoting mid-incident without change control. Detection shows a block / prevent action. Process is not still running on RTR ps . Detect on the assigned policy Pilot, noisy app, or a documented exception with an owner. You treat Detect as “Falcon failed” on the bridge. Policy name + Detect slider quoted. Detection exists. Process may still be running — that is the mode. Custom IOA Detect / Prevent You need a behavior your org owns (image filename, command-line regex, parent/child). You expected a hash IOC to catch a living-off-the-land rename. Rule group enabled. action_label matches what you intended. Detection names the rule. IOA exclusion (scoped) A known-good tool matches an IOA. Host group + ifn_regex / cl_regex + owner + expiry. Tenant-wide ML off, or an exclude with no owner so Finance can work. Exclusion id + groups listed. Next event of that pattern does not open a new Detection. Network contain Live AID, real tactic (Credential Access / T1003), status still normal . last_seen is days old. You would only contain the leftover AID. status=contained on the live AID. last_seen still incrementing. RTR still opens. RTR (read, then active responder) You need live proof: ps , ls , get , filehash . Change ticket already open. Host is dark. You treat RTR as a scratch pad and rm first. Session initialized. Commands return. Session refreshed before 5 minutes. Audit trail exists. Detect versus Prevent is a port contract for the factory, not a vibe. Official wording: prevention policies manage what activity will trigger detections and preventions on your hosts. Custom IOA rules add your own behavior on top. Source: Prevention Policy API + Custom IOA API + CrowdStrike IOA overview. Interview phrasing I say last_seen, then the assigned policy stamp, then the cloud tactic. I contain a live host. I do not start with “Falcon missed it,” and I do not say isolate. ## 5. Runbook Side A → B → C Lab values only. CID FALCON-LAB , hostname DEVICE-LAB-17 , live AID aid-lab-17-live , leftover AID aid-lab-17-old , user example\finance.user , client 192.0.2.25 , Detection DET-1042 , host group Finance-Workstations . Nothing here is a live tenant. Confirm console labels on your Falcon build — CrowdStrike ships UI updates. Primary source for each block is named under the steps. ### Side A — sensor and host groups (building the factory floor) Primary source: CrowdStrike Hosts API + Host setup and management → Host management (Falcon documentation portal; also CrowdStrike tech-hub “Installing Falcon Sensor”). #### Filter hostname, then sort Last seen Host setup and management → Host management . Filter DEVICE-LAB-17 . Official fields: hostname , last_seen , device_id , agent_version , status , reduced_functionality_mode . If two rows share the hostname, you have a duplicate AID problem before you have an IOA problem. Work the row with last_seen in seconds. - #### Read RFM and containment status RFM yes means the worker is injured — limited telemetry and prevention. Status normal means not contained. containment_pending on a stale last_seen is theatre, not IR. Source: Hosts API filters reduced_functionality_mode , status . - #### Note sensor version and the update ring Host setup and management → Sensor update policies . An offline host that failed a sensor update is a visibility gap, not this IOA, unless last_seen is stale on this AID. Official field: agent_version . https://falcon.lab.techclick.example — Host setup and management › Host management Training mock · not live Host setup and management  ›  Host management  ›  DEVICE-LAB-17 ### Host management Hosts Hidden hosts Groups hostname:'DEVICE-LAB-17' Apply Filter Hostname Last seen Status RFM Sensor AID (lab) Group DEVICE-LAB-17 22s normal no 7.18 aid-lab-17-live Finance-Workstations DEVICE-LAB-17 12d normal no 7.11 aid-lab-17-old Unassigned DEVICE-LAB-04 4d normal yes 7.18 pending aid-lab-04 N-1 ring Containment Off · status=normal · last-action=none Assigned prevention policy Finance-Workstations · enabled Two rows, one hostname. Work aid-lab-17-live . The 12-day AID is leftover — do not contain it. DEVICE-LAB-04 is a sensor ticket (RFM + last_seen 4d). Real Time Response Network contain Source: Hosts API — last_seen , status = normal / containment_pending / contained / lift_containment_pending, reduced_functionality_mode , device_id , actions contain / lift_containment / hide_host . Dummy values only. Predicted host record — Techclick dummy lab GET /devices/queries/devices/v1?filter=hostname:'DEVICE-LAB-17'&sort=last_seen.desc device_id : aid-lab-17-live hostname : DEVICE-LAB-17 last_seen : 2026-08-16T10:42:18Z status : normal reduced_functionality_mode : no agent_version : 7.18 platform_name : Windows product_type_desc : Workstation Say the word predicted . This filter is a what-if on the factory floor. The live Detection may attach to a different AID if you sorted wrong. Compare it to the Host management row and the RTR session in Side C. ### Side B — prevention policy and IOA (printing the ticket, choosing stamps) Primary source: Prevention Policy API + Custom IOA API + IOA Exclusions API. Path: Endpoint security → Configure → Prevention policies . Remember: the host inherits the policy assigned to its group. Precedence matters. Enable / disable is a factory switch, not a reboot. https://falcon.lab.techclick.example — Endpoint security › Configure › Prevention policies › Finance-Workstations Training mock · not live Endpoint security  ›  Configure  ›  Prevention policies  ›  Finance-Workstations ### Prevention policy General Prevention settings Assigned groups Precedence Name Finance-Workstations Platform Windows Enabled yes Assigned host groups Finance-Workstations Cloud anti-malware Prevent Aggressive Sensor anti-malware Prevent Moderate Interpreter / script Detect Detect Sensor tampering Enabled Read the assigned policy, not the platform default. A Detect slider on interpreter/script means encoded PowerShell can still run — the factory will write a verdict, not a kill. Confirm slider names on your Falcon build. Cancel Save · then assign group Source: Prevention Policy API — create / update settings, enable / disable , add-host-group , set precedence. Custom IOA path is Endpoint security → Configure → Custom IOA. Dummy values only. - #### Confirm the assigned policy, not the default Open the policy name on the host card, then the policy. Finance-Workstations Prevent is not the same as a detect-only pilot group. Official actions: add-host-group , enable , disable , set precedence. Source: Prevention Policy API. - #### Name Detect vs Prevent out loud If the slider that matches this behavior is Detect, the process is allowed and a Detection is written. That is the product doing what you configured. Promote the slider under change control, or contain this one host — do not write “missed.” - #### If you wrote the behavior yourselves, open Custom IOA Endpoint security → Configure → Custom IOA . Official filters: rules.action_label , rules.pattern_severity , enabled . A custom IOA is a behavior stamp (image filename, command-line regex, process create). It is not a hash IOC. Source: Custom IOA API. - #### If you must except, except small Endpoint security → Configure → Exclusions → IOA Exclusions , or Create IOA exclusion from the Detection. Official fields: ifn_regex , cl_regex , groups , name, comment. Host group + owner + expiry. Never a tenant-wide ML off. Source: IOA Exclusions API. Assigned policy — Techclick dummy lab GET /policy/combined/prevention/v1?filter=name:'Finance-Workstations' name : Finance-Workstations platform_name : Windows enabled : true precedence : 2 groups : Finance-Workstations settings : cloud ML = Prevent / Aggressive interpreter-script = Detect sensor tampering = enabled The factory printed Detect on interpreter/script. Encoded PowerShell can still be running. That is Side B, not a cloud outage. ### Side C — cloud verdict, then RTR (prove the ticket) Primary source: Alerts / Detects APIs + Real Time Response API + CrowdStrike EDR (network containment). Path: Activity → Detections (some builds: Endpoint detections or Next-Gen SIEM alert), then Host management → Real Time Response . - #### Open the Detection and quote the verdict Official Alert fields: tactic , technique , severity , status , created_timestamp . DET-1042 in this lab is Credential Access / T1003. A filename in Slack is not the verdict. Process Tree on the Detection is parent → child → command line — historical EDR, not live RTR. - #### If the tactic is real and last_seen is seconds, contain the live AID Host management → select aid-lab-17-live → Network contain . Official action name is contain . Status moves normal → containment_pending → contained . Lift is lift_containment . A contained host keeps a channel to the CrowdStrike cloud so RTR still works. It stays contained across reboot. Source: Hosts PerformActionV2 + CrowdStrike EDR / contain video. - #### Initialize RTR, then collect Official: RTR_InitSession before any command. Refresh before 5 minutes ( RTR_PulseSession / batch refresh). Read-only first: ps , ls , cat , filehash . Active responder ( get , kill , cp , rm ) is a change. A dark host queues; it does not collect. Source: Real Time Response API. - #### If last_seen is days, stop. That is a sensor ticket RTR will not connect. Contain sits on containment_pending . Fix power, network, RFM, or reinstall with the current CID. Do not debate the IOA. https://falcon.lab.techclick.example — Activity › Detections › DET-1042 Training mock · not live Activity → Detections → DET-1042 ### Detection details Detection ID DET-1042 Status new Tactic verdict Credential Access Technique T1003 · OS Credential Dumping Severity high Policy stamp Finance-Workstations · interpreter = Detect Process tree WINWORD.EXE → powershell.exe -enc … → rundll32.exe # RTR session · aid-lab-17-live · expires unless refreshed > ps powershell.exe  pid=4820  ppid=4412  user=example\finance.user rundll32.exe    pid=4904  ppid=4820 session=up last_seen=22s status=normal Cloud verdict is Credential Access / T1003. Policy stamp is Detect — the process is still in ps . Contain the live AID, then collect. Do not start with lsass.bin. Click next: Network contain aid-lab-17-live , refresh the RTR session before 5 minutes, get the encoded script with a change number. Source: Alerts API + Real Time Response API + Hosts contain . Proof · verdict + RTR cockpit Notice: juniors stare at the filename. Seniors stare at last_seen, the assigned slider, the tactic, and whether the RTR session actually opened. Live verdict — dummy lab, not a customer CID detection : DET-1042 device_id : aid-lab-17-live last_seen : 22s status : normal tactic : Credential Access technique : T1003 severity : high detection_status : new policy : Finance-Workstations policy_stamp : interpreter-script = Detect rtr_session : up rtr_ps : powershell.exe pid=4820 still running contain : off Green success on this runbook Predicted host = aid-lab-17-live , last_seen seconds, RFM no . Assigned policy = Finance-Workstations . Cloud verdict quoted (tactic / technique). If you contained: status=contained and last_seen still incrementing. If you used RTR: session initialized, commands returned, session refreshed. Action Detect with a live process is a printed ticket, not a miss. last_seen 4 days with an empty RTR session is not IR. ## 6. Runtime — contain, RTR expiry, dark hosts After the slot exists, later events of the same process tree skip the “is this a new story?” question and ride the existing Detection. Official RTR: the session is a second live object. It expires after 5 minutes unless you refresh it. Official contain: the sensor stays up on purpose so the cloud channel — and RTR — keep working. Everything else is cut except IPs on the containment policy. If you moved a Prevention slider after the process already started, the running process may keep the old stamp until it dies. That is the later-events bar in Flow 2. Do not call it a failed save. Wait for a new process, or contain this host now because the tactic is real. If last_seen goes stale after you click contain, status sits on containment_pending . That is a sensor / network problem, not a contain API bug. Official Hosts action still recorded the request. The worker never picked it up. HA for Falcon is not two firewalls. The factory is the cloud plus every sensor. A green tray on a laptop whose AID last_seen is Monday is one worker who clocked out. Hide the leftover AID after change control so detections stop attaching to a ghost ( hide_host ). Flow 3 · contain + RTR runtime Contained Falcon host can reach the cloud and allowlisted IPs; RTR stays open - Host contained status=contained Falcon cloud always allowed RTR session refresh Interview close you can steal Falcon is a sensor + cloud verdict factory. The sensor prints an event. Detection and prevention policy stamp Detect or Prevent. The cloud writes tactic and technique. I prove the ticket with last_seen, the assigned policy, the Detection, and an RTR session. A Detect stamp is not a miss. I contain a live host. I do not say isolate. Related: The evidence desk · CrowdStrike Falcon hub · Dummy lab ## Knowledge check Six judgment questions. Map each miss back to the section named in the reason. Q1 A ticket says Falcon missed LSASS. What is the factory’s first object you must prove? The filename on the Slack screenshot That this AID’s sensor printed an event the cloud could stamp — last_seen in seconds, RFM no, correct device_id Whether ML is enabled tenant-wide Whether the VLAN is already isolated Correct: b . Sensor → event is station 1. A dark or wrong AID cannot manufacture the ticket. Re-read Why a green tray is not a verdict and Side A. Q2 On the Falcon factory floor, what are Detect and Prevent? Two separate products you buy and cable in series Cloud regions — Detect is US-1, Prevent is US-2 Stamps the assigned prevention policy (or custom IOA action_label) writes on one event — Detect logs and allows, Prevent logs and stops RTR permission tiers that replace last_seen Correct: c . One event, policy stamps. Detect is not a miss. Re-read Mental model and How to choose the stamps. Q3 DET-1042 shows tactic Credential Access, the process is still in RTR ps, and the assigned interpreter slider is Detect. What happened? The factory printed a live ticket with a Detect stamp — the product did what that host group is configured to do Falcon missed it and you should disable Prevent for the CID The sensor is dark, because a running process always means last_seen is stale You need a new AID before any Detection can be real Correct: a . Cloud verdict exists. Policy stamp is Detect. Contain if the tactic is real; promote the slider under change control. Re-read Side B and Side C. Q4 You need live proof from DEVICE-LAB-17. Official RTR fact you must not invert? RTR does not need a session — any console click runs ps on every host RTR works the same on a host whose last_seen is four days old Falcon isolates the host before RTR can start Initialize a session first; it expires after 5 minutes unless refreshed; a dark host queues and does not collect Correct: d . Official Real Time Response API: init session, pulse / refresh, 5-minute expiry. Re-read First event vs later events and Side C. Q5 Host management shows two AIDs for DEVICE-LAB-17. First factory move? Network-contain both AIDs so the filename cannot spread Sort by last_seen and work the live device_id — hide the leftover after change control Delete the Prevention policy so detections stop doubling Reimage immediately without naming an AID Correct: b . Duplicate AID lives inside station 1. Containing the 12-day leftover does not touch the laptop on the desk. Re-read Side A and the Host management mock. Q6 What proves the Falcon factory actually printed a working ticket for DET-1042? A green tray icon, even if last_seen is four days old A saved Prevention policy, even if you never opened the Detection Live last_seen on the correct AID, assigned policy stamp quoted, cloud tactic/technique quoted, and an RTR session that opened (or status=contained with last_seen still incrementing) Empty Detections, because a green icon already proved the cloud Correct: c . Sensor, policy, verdict, RTR. Tray and save are not proof. Re-read Side C and the proof checklist. Field map: evidence desk. Check answers Reset ## Sources - CrowdStrike developer — Hosts API — last_seen , device_id , agent_version , reduced_functionality_mode , status = normal / containment_pending / contained / lift_containment_pending; actions contain , lift_containment , hide_host - CrowdStrike developer — Prevention Policy — policies control detection and blocking; enable / disable; add-host-group; precedence - CrowdStrike developer — Custom IOA — rule groups; rules.action_label ; rules.pattern_severity - CrowdStrike developer — IOA Exclusions — ifn_regex , cl_regex , groups - CrowdStrike developer — Alerts API — tactic , technique , severity , status , created_timestamp - CrowdStrike developer — Detects API — detection state and assignee - CrowdStrike developer — Real Time Response — init session, refresh, 5-minute expiry; ps , ls , get , filehash , kill - CrowdStrike developer — Real Time Response Admin - CrowdStrike developer — Manage your fleet — last seen, containment status, prevention / response policies - CrowdStrike — What is EDR? — network containment; Real Time Response; process executions - CrowdStrike — How to network contain an infected system - CrowdStrike — Indicators of Attack (IOA) - CrowdStrike — IOA vs IOC - CrowdStrike — Try Falcon — single lightweight sensor; 100% cloud console; protection while offline - CrowdStrike tech-hub — Installing Falcon Sensor — Host Setup and Management; Host management - Falcon documentation portal — confirm current console paths and prevention-policy slider labels on your build Related: The Falcon evidence desk — first tool + proof field · CrowdStrike Falcon hub · Dummy lab --- Cite this Techclick lesson with the source URL. 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