[{"data":1,"prerenderedAt":-1},["ShallowReactive",2],{"summary-scale-stateless-backends-by-broadcasting-client-up-summary":3,"summaries-facets-categories":105,"summary-related-scale-stateless-backends-by-broadcasting-client-up-summary":4510},{"id":4,"title":5,"ai":6,"body":13,"categories":82,"created_at":84,"date_modified":84,"description":75,"extension":85,"faq":84,"featured":86,"kicker_label":84,"meta":87,"navigation":88,"path":89,"published_at":90,"question":84,"scraped_at":84,"seo":91,"sitemap":92,"source_id":93,"source_name":94,"source_type":95,"source_url":96,"stem":97,"tags":98,"thumbnail_url":84,"tldr":102,"tweet":84,"unknown_tags":103,"__hash__":104},"summaries\u002Fsummaries\u002Fscale-stateless-backends-by-broadcasting-client-up-summary.md","Scale Stateless Backends by Broadcasting Client Updates",{"provider":7,"model":8,"input_tokens":9,"output_tokens":10,"processing_time_ms":11,"cost_usd":12},"openrouter","x-ai\u002Fgrok-4.1-fast",5509,1238,12235,0.0016983,{"type":14,"value":15,"toc":74},"minimark",[16,21,25,28,32,35,38,41,45,48,51,55,71],[17,18,20],"h2",{"id":19},"connection-ownership-mismatch-causes-silent-failures","Connection Ownership Mismatch Causes Silent Failures",[22,23,24],"p",{},"In single-instance deployments, callbacks from async workflows reach the same process holding the client's SSE or WebSocket connection, delivering updates instantly. Horizontal scaling with Kubernetes replicas behind a load balancer breaks this: clients connect to one pod (e.g., Pod A), but callbacks hit another (Pod B). Pod B processes correctly—validates, logs, persists state, returns 200 OK—but can't deliver since it lacks the in-memory connection. Users see no updates despite healthy metrics (low CPU, latency, errors). This 'distributed client-context problem' emerges because stateless services scale execution but not long-lived connections, which remain process-local state.",[22,26,27],{},"Cloud-native statelessness excels for scaling and recovery but ignores that connections bind to specific replicas. Async webhooks and background jobs land anywhere, decoupling execution from delivery without explicit coordination.",[17,29,31],{"id":30},"decouple-processing-from-delivery-using-pubsub","Decouple Processing from Delivery Using Pub\u002FSub",[22,33,34],{},"Sticky sessions or switching SSE to WebSockets fail because they don't solve replica mismatch. Instead, add a broadcast layer: receiving replica publishes events to a shared channel (Redis Pub\u002FSub fits for low-latency fan-out). All replicas subscribe; only the connection-owning one forwards to the client.",[22,36,37],{},"Derive stable channel IDs from user\u002Frequest IDs. Each pod maps these to active in-memory connections via a shared subscriber, avoiding per-client subscriptions that don't scale. Clean up mappings on disconnect to prevent stale references, memory leaks, or race conditions during reconnects. This makes delivery predictable without routing callbacks to specific pods.",[22,39,40],{},"Stateless services don't eliminate state—they relocate it (e.g., to Redis). Coordination treats delivery as a separate concern from processing, enabling clean horizontal scaling.",[17,42,44],{"id":43},"monitor-end-to-end-delivery-not-just-processing","Monitor End-to-End Delivery, Not Just Processing",[22,46,47],{},"Dashboards miss this: processing succeeds (green metrics), but delivery fails silently. Propagate correlation IDs across initiation, callback, publication, and client receipt to trace divergences. Alert on coordination health—e.g., published events without deliveries—beyond infrastructure metrics.",[22,49,50],{},"Make updates idempotent: duplicates harmless, misses recoverable by client polling authoritative backend state. Streaming enhances UX but isn't correctness; backend state remains source of truth. Redis Pub\u002FSub's transience (lost on restarts) reinforces this discipline.",[17,52,54],{"id":53},"design-rules-prevent-recurrence","Design Rules Prevent Recurrence",[56,57,58,62,65,68],"ul",{},[59,60,61],"li",{},"Treat connections as local state, not shared.",[59,63,64],{},"Broadcast for any-node completion.",[59,66,67],{},"Track full-path delivery with correlation IDs.",[59,69,70],{},"Ensure idempotency and authoritative state.",[22,72,73],{},"Ask upfront: which replica owns the connection, and how does the system find it? This beats transport tweaks. Modern Kubernetes dynamism, webhook reliance, and real-time UIs amplify the issue in event-driven SaaS.",{"title":75,"searchDepth":76,"depth":76,"links":77},"",2,[78,79,80,81],{"id":19,"depth":76,"text":20},{"id":30,"depth":76,"text":31},{"id":43,"depth":76,"text":44},{"id":53,"depth":76,"text":54},[83],"DevOps & Cloud",null,"md",false,{},true,"\u002Fsummaries\u002Fscale-stateless-backends-by-broadcasting-client-up-summary","2026-04-08 21:21:18",{"title":5,"description":75},{"loc":89},"8d886af13994638f","Level Up Coding","article","https:\u002F\u002Funknown","summaries\u002Fscale-stateless-backends-by-broadcasting-client-up-summary",[99,100,101],"devops","cloud","backend","Horizontal scaling routes callbacks to replicas without client SSE\u002FWebSocket connections, silently dropping updates—broadcast via Redis Pub\u002FSub so the owning replica delivers 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But three weeks post-launch, a B2B client's guest users logged in successfully yet hit 403 errors due to mismatched identity. Guests have active sessions and valid Azure AD accounts, but ",[4529,4534,4531],{}," doesn't provide a usable email—it's often absent, null, or mismatched for external users invited via B2B collaboration. This single claim broke the entire auth flow, granting sessions without proper rights.",[22,4537,4538,4539,4541],{},"To replicate and confirm: Employee flow succeeds (",[4529,4540,4531],{}," == email), guest flow authenticates but fails authorization since the claim can't anchor whitelists reliably.",[17,4543,4545],{"id":4544},"preferred_username-limitations-for-guests","preferred_username Limitations for Guests",[22,4547,4548,4550],{},[4529,4549,4531],{}," isn't a true email field—it's a user-provided hint for login names, populated only for workplace-joined accounts. For B2B guests (external users invited to your tenant), Azure AD doesn't set it to their guest email; it might reflect their home tenant's UPN or be empty. Result: Your system sees a non-email value or null, failing email-based checks for access groups or features.",[22,4552,4553],{},"Trade-off: Convenient for internal users (matches UPN\u002Femail), but zero fallback for guests. Never use it as the sole identifier—it's not guaranteed unique or stable across user types.",[17,4555,4557],{"id":4556},"anchor-identities-on-oid-for-cross-user-stability","Anchor Identities on oid for Cross-User Stability",[22,4559,4560,4561,4564,4565,4568],{},"Use Azure AD's ",[4529,4562,4563],{},"oid"," (object ID) claim instead: a stable, tenant-wide UUID unique to every user, including guests. Pair it with ",[4529,4566,4567],{},"userType"," (\"Member\" vs \"Guest\") to differentiate and route logic:",[56,4570,4571,4577,4591],{},[59,4572,4573,4574,4576],{},"Fetch user details via Microsoft Graph API using ",[4529,4575,4563],{},".",[59,4578,4579,4580,4582,4583,4586,4587,4590],{},"Check ",[4529,4581,4567],{}," to apply guest-specific handling (e.g., map to external email from ",[4529,4584,4585],{},"mail"," or ",[4529,4588,4589],{},"userPrincipalName",").",[59,4592,4593],{},"Whitelist based on verified attributes, not fragile claims.",[22,4595,4596],{},"This ensures employees and guests both resolve correctly without silent failures. Post-fix: Validate claims in dev\u002Fstaging with mixed user types, and monitor auth logs for claim mismatches to catch regressions early.",{"title":75,"searchDepth":76,"depth":76,"links":4598},[4599,4600,4601],{"id":4523,"depth":76,"text":4524},{"id":4544,"depth":76,"text":4545},{"id":4556,"depth":76,"text":4557},[127],{"content_references":4604,"triage":4605},[],{"relevance":4606,"novelty":4607,"quality":4606,"actionability":4606,"composite":4608,"reasoning":4609},4,3,3.8,"Category: DevOps & Cloud. The article addresses a specific pain point regarding Azure AD authentication for B2B guests, providing actionable guidance on using `oid` instead of `preferred_username` for reliable identification. It offers concrete steps for implementing a more stable authentication flow, which is directly applicable to developers working with Azure AD.","\u002Fsummaries\u002Fditch-preferred-username-for-azure-ad-guest-auth-summary","2026-05-06 14:20:27","2026-05-06 16:13:27",{"title":4513,"description":75},{"loc":4610},"22a507e9a7c41be0","https:\u002F\u002Flevelup.gitconnected.com\u002Fwe-shipped-broken-auth-for-every-guest-user-an-azure-ad-oauth-post-mortem-6cf6f70c6909?source=rss----5517fd7b58a6---4","summaries\u002Fditch-preferred-username-for-azure-ad-guest-auth-summary",[101,99,100,4619],"authentication","Using preferred_username as identity anchor worked for employees but failed silently for all B2B guests, causing 403 errors post-launch. Anchor on oid instead for reliable identification.",[4619],"hCDsaZKJv8MRJeFb-Jzt8D0l0t_9kswDVSLcb3eW35c",{"id":4624,"title":4625,"ai":4626,"body":4631,"categories":4676,"created_at":84,"date_modified":84,"description":75,"extension":85,"faq":84,"featured":86,"kicker_label":84,"meta":4677,"navigation":88,"path":4683,"published_at":4684,"question":84,"scraped_at":4685,"seo":4686,"sitemap":4687,"source_id":4688,"source_name":4689,"source_type":95,"source_url":4690,"stem":4691,"tags":4692,"thumbnail_url":84,"tldr":4693,"tweet":84,"unknown_tags":4694,"__hash__":4695},"summaries\u002Fsummaries\u002Fmount-s3-buckets-as-file-systems-with-aws-s3-files-summary.md","Mount S3 Buckets as File Systems with AWS S3 Files",{"provider":7,"model":8,"input_tokens":4627,"output_tokens":4628,"processing_time_ms":4629,"cost_usd":4630},3939,1507,8922,0.00151865,{"type":14,"value":4632,"toc":4671},[4633,4637,4640,4647,4651,4654,4657,4661,4664],[17,4634,4636],{"id":4635},"s3-files-delivers-native-file-system-access-to-s3","S3 Files Delivers Native File System Access to S3",[22,4638,4639],{},"AWS S3 Files transforms object storage into a POSIX-compliant file system mountable on EC2 instances, containers, and Lambda functions. This eliminates custom hacks like FUSE wrappers or periodic sync scripts, providing low-latency read\u002Fwrite access indistinguishable from local disks for AI\u002FML, data engineering, and DevOps workloads. Under the hood, it leverages S3's metadata for directory structures and supports standard file operations without data migration—your existing buckets work immediately.",[22,4641,4642,4643,4646],{},"To implement, grant IAM roles with s3:PutObject, s3:GetObject, etc., permissions scoped to the bucket prefix, then mount via AWS CLI or SDK: ",[4529,4644,4645],{},"aws s3files mount s3:\u002F\u002Fyour-bucket \u002Fmnt\u002Fpoint",". This cuts integration time from hours of scripting to minutes, enabling seamless data access in containerized ML training pipelines or serverless inference.",[17,4648,4650],{"id":4649},"realistic-use-cases-in-aiml-and-devops","Realistic Use Cases in AI\u002FML and DevOps",[22,4652,4653],{},"For AI\u002FML teams, mount training datasets directly into Jupyter on EC2 or SageMaker, avoiding costly EBS volumes or data downloads—process petabyte-scale S3 data at near-native speeds. DevOps benefits include containerized ETL jobs reading\u002Fwriting S3 as local files without volume mounts, and Lambda functions handling file I\u002FO for event-driven processing without temporary storage hacks.",[22,4655,4656],{},"Trade-offs: Strong consistency for small files (\u003C100MB), eventual consistency for large ones; throughput caps at S3's request rates (3,500 PUT\u002FGET per prefix\u002Fsec). Ideal for read-heavy ML feature stores or log processing, less so for high-write transactional DBs.",[17,4658,4660],{"id":4659},"avoid-common-pitfalls-security-cost-data-risks","Avoid Common Pitfalls: Security, Cost, Data Risks",[22,4662,4663],{},"Misconfigurations amplify S3's pitfalls: Broad IAM policies expose buckets publicly—use least-privilege with bucket policies denying public access and encrypting at-rest\u002Ftransit. Costs spike from unoptimized PUTs (e.g., frequent small writes); batch operations and use Intelligent-Tiering to mitigate, monitoring via CloudWatch for >$0.023\u002FGB PUT fees.",[22,4665,4666,4667,4670],{},"Data loss hits from concurrent writes without locks—implement app-level semaphores or use S3 atomic operations. Test mounts in staging: unmount with ",[4529,4668,4669],{},"aws s3files unmount \u002Fmnt\u002Fpoint"," to verify no corruption. Always enable versioning and MFA-delete on production buckets.",{"title":75,"searchDepth":76,"depth":76,"links":4672},[4673,4674,4675],{"id":4635,"depth":76,"text":4636},{"id":4649,"depth":76,"text":4650},{"id":4659,"depth":76,"text":4660},[83],{"content_references":4678,"triage":4679},[],{"relevance":4680,"novelty":4606,"quality":4606,"actionability":4606,"composite":4681,"reasoning":4682},5,4.35,"Category: DevOps & Cloud. The article provides a detailed explanation of how AWS S3 Files can be used to enhance AI\u002FML workflows by transforming S3 buckets into file systems, addressing a specific pain point for developers looking to streamline data access. It includes practical implementation steps and highlights potential pitfalls, making it actionable for the target audience.","\u002Fsummaries\u002Fmount-s3-buckets-as-file-systems-with-aws-s3-files-summary","2026-04-18 18:01:01","2026-04-19 01:22:18",{"title":4625,"description":75},{"loc":4683},"73f55123201134f9","Towards AI","https:\u002F\u002Fpub.towardsai.net\u002Faws-s3-files-explained-the-smarter-way-to-turn-s3-buckets-into-file-systems-3459560f7046?source=rss----98111c9905da---4","summaries\u002Fmount-s3-buckets-as-file-systems-with-aws-s3-files-summary",[99,100],"AWS S3 Files mounts buckets directly as file systems on EC2, containers, and Lambda—eliminating FUSE hacks and sync scripts for AI\u002FML workflows, but misconfigurations risk exposing, corrupting, or losing data.",[],"H0SyvLhuPk2hJvF0qRUF-tBjKgYnnAhPe4UoY1GB-uc",{"id":4697,"title":4698,"ai":4699,"body":4704,"categories":4730,"created_at":84,"date_modified":84,"description":75,"extension":85,"faq":84,"featured":86,"kicker_label":84,"meta":4731,"navigation":88,"path":4735,"published_at":4736,"question":84,"scraped_at":4737,"seo":4738,"sitemap":4739,"source_id":4740,"source_name":94,"source_type":95,"source_url":4741,"stem":4742,"tags":4743,"thumbnail_url":84,"tldr":4744,"tweet":84,"unknown_tags":4745,"__hash__":4746},"summaries\u002Fsummaries\u002Fzero-leak-debt-kill-100-leaked-secrets-platform-wi-summary.md","Zero Leak Debt: Kill 100+ Leaked Secrets Platform-Wide",{"provider":7,"model":8,"input_tokens":4700,"output_tokens":4701,"processing_time_ms":4702,"cost_usd":4703},3867,1345,10526,0.00142325,{"type":14,"value":4705,"toc":4726},[4706,4710,4713,4716,4720,4723],[17,4707,4709],{"id":4708},"leak-debt-persists-for-years-undermining-platforms","Leak Debt Persists for Years, Undermining Platforms",[22,4711,4712],{},"Leaked secrets accumulate as 'leak debt,' remaining active long after exposure—transaction keys from 2022 continued processing payments undetected. Every platform accumulates this debt differently based on stack, but it kills security and reliability. The author shares hands-on experience eliminating 100+ live leaks across local development, CI\u002FCD pipelines, and production environments, revealing a universal pattern: sprawl leads to chaos until teams commit to zero tolerance.",[22,4714,4715],{},"Static secrets create ongoing risks because they expire unexpectedly or demand manual rotation, amplifying vulnerabilities. Platforms suffer uniquely—GitOps teams battle repo exposures, service meshes grapple with identity issues—but all chase the same outcome: secrets that self-manage without human intervention.",[17,4717,4719],{"id":4718},"ruthless-audit-and-prevention-path-to-zero-debt","Ruthless Audit and Prevention Path to Zero Debt",[22,4721,4722],{},"Transition from chaos requires three steps: discover the mess through comprehensive scans, audit ruthlessly to prioritize live threats (e.g., still-valid 2022 keys), and enforce prevention via dynamic tools. Teams adopt stack-specific solutions like HashiCorp Vault for centralized management, AWS or GCP Secrets Manager for cloud-native rotation, Sealed Secrets for GitOps, or SPIFFE for service meshes.",[22,4724,4725],{},"This isn't a generic checklist but proven patterns from production battles: replace static secrets entirely to eliminate leak debt. Outcomes include no leaks, automatic rotation, and zero manual interventions, securing platforms end-to-end. The content cuts off mid-journey but emphasizes sharing these learnings for peer teams facing identical sprawl.",{"title":75,"searchDepth":76,"depth":76,"links":4727},[4728,4729],{"id":4708,"depth":76,"text":4709},{"id":4718,"depth":76,"text":4719},[83],{"content_references":4732,"triage":4733},[],{"relevance":4606,"novelty":4607,"quality":4606,"actionability":4606,"composite":4608,"reasoning":4734},"Category: DevOps & Cloud. The article addresses a specific pain point regarding the management of leaked secrets, which is crucial for maintaining security in AI-powered products. It provides actionable steps for auditing and preventing leak debt, making it relevant for developers and product builders.","\u002Fsummaries\u002Fzero-leak-debt-kill-100-leaked-secrets-platform-wi-summary","2026-04-15 14:55:38","2026-04-15 15:38:58",{"title":4698,"description":75},{"loc":4735},"71dc58e232e9091c","https:\u002F\u002Flevelup.gitconnected.com\u002Fmost-leaked-secrets-live-for-years-the-hidden-leak-debt-killing-your-platform-47e74da51697?source=rss----5517fd7b58a6---4","summaries\u002Fzero-leak-debt-kill-100-leaked-secrets-platform-wi-summary",[99,100],"Leaked secrets from 2022 still process payments as 'leak debt'; ruthlessly audit across local dev, CI\u002FCD, and production to reach zero static secrets that never leak, expire unexpectedly, or need manual rotation.",[],"aAiDRQtMgTlLYI0tXHkxL7K0c8mpVbfv0twLMuEUIDE",{"id":4748,"title":4749,"ai":4750,"body":4755,"categories":4792,"created_at":84,"date_modified":84,"description":75,"extension":85,"faq":84,"featured":86,"kicker_label":84,"meta":4793,"navigation":88,"path":4808,"published_at":4809,"question":84,"scraped_at":4810,"seo":4811,"sitemap":4812,"source_id":4813,"source_name":4814,"source_type":95,"source_url":4815,"stem":4816,"tags":4817,"thumbnail_url":84,"tldr":4819,"tweet":84,"unknown_tags":4820,"__hash__":4821},"summaries\u002Fsummaries\u002Fmrc-openai-s-protocol-for-resilient-ai-training-ne-summary.md","MRC: OpenAI's Protocol for Resilient AI Training Networks",{"provider":7,"model":8,"input_tokens":4751,"output_tokens":4752,"processing_time_ms":4753,"cost_usd":4754},8465,1915,20569,0.00214365,{"type":14,"value":4756,"toc":4787},[4757,4761,4764,4767,4770,4774,4777,4780,4784],[17,4758,4760],{"id":4759},"multipath-mechanisms-eliminate-congestion-and-enable-fast-recovery","Multipath Mechanisms Eliminate Congestion and Enable Fast Recovery",[22,4762,4763],{},"In large AI training clusters, network congestion, link failures, and jitter cause GPU idle time, amplifying costs as clusters scale to millions of data transfers per step. MRC builds on RoCEv2 for hardware-accelerated RDMA over Ethernet and SRv6 for static source routing, shifting intelligence to NICs while switches follow pre-configured paths blindly. This avoids interference from dynamic routing.",[22,4765,4766],{},"Adaptive packet spraying distributes packets across hundreds of paths at the NIC level, achieving higher bandwidth, reduced tail latency, and packet-level load balancing—unlike single-path RoCEv2. For failures, MRC detects issues in microseconds and reroutes: if an 8-port 800Gb\u002Fs NIC loses one port, it drops to 7\u002F8 capacity but recalculates paths instantly, notifies peers to avoid the failed plane, and restores it within a minute upon recovery. Conventional fabrics take seconds to tens of seconds, often crashing jobs; MRC keeps training alive with minimal performance hit.",[22,4768,4769],{},"AMD's NSCC congestion control integrates via UEC specs, preserving RDMA semantics while adding multipath support.",[17,4771,4773],{"id":4772},"multi-plane-architecture-cuts-tiers-costs-and-latency","Multi-Plane Architecture Cuts Tiers, Costs, and Latency",[22,4775,4776],{},"MRC reimagines NICs as multiple smaller links (e.g., one 800Gb\u002Fs interface split into eight 100Gb\u002Fs to eight switches), enabling a two-tier Clos network for 131,000 GPUs versus three-to-four tiers in 800Gb\u002Fs designs. Longest paths cross three switches instead of five-to-seven, slashing latency.",[22,4778,4779],{},"For full bisection bandwidth, this uses 2\u002F3 the optics and 3\u002F5 the switches of three-tier networks, reducing power, cost, and failure blast radius. A tier-1 switch failure (e.g., rebooting four during training) no longer halts jobs.",[17,4781,4783],{"id":4782},"production-on-named-hardware-across-openai-clusters","Production on Named Hardware Across OpenAI Clusters",[22,4785,4786],{},"Deployed on 400\u002F800Gb\u002Fs RDMA NICs like NVIDIA ConnectX-8, AMD Pollara\u002FVulcano, Broadcom Thor Ultra; SRv6 switches include NVIDIA Spectrum-4\u002F5 (Cumulus\u002FSONiC) and Broadcom Tomahawk 5 (Arista EOS). Powers NVIDIA GB200 supercomputers in OpenAI's Stargate (OCI Abilene, TX) and Microsoft's Fairwater (Atlanta\u002FWisconsin), training ChatGPT and Codex models without job interruptions from failures.",{"title":75,"searchDepth":76,"depth":76,"links":4788},[4789,4790,4791],{"id":4759,"depth":76,"text":4760},{"id":4772,"depth":76,"text":4773},{"id":4782,"depth":76,"text":4783},[83],{"content_references":4794,"triage":4805},[4795,4800],{"type":4796,"title":4797,"url":4798,"context":4799},"paper","Resilient AI Supercomputer Networking using MRC and SRv6","https:\u002F\u002Fcdn.openai.com\u002Fpdf\u002Fresilient-ai-supercomputer-networking-using-mrc-and-srv6.pdf","cited",{"type":4801,"title":4802,"url":4803,"context":4804},"other","MRC Supercomputer Networking Technical Details","https:\u002F\u002Fopenai.com\u002Findex\u002Fmrc-supercomputer-networking\u002F","recommended",{"relevance":4607,"novelty":4607,"quality":4606,"actionability":76,"composite":4806,"reasoning":4807},3.05,"Category: AI & LLMs. The article discusses OpenAI's MRC protocol, which is relevant to AI infrastructure but lacks direct applicability for product builders looking for actionable insights. While it presents some new technical details about network optimization for AI training, it does not provide practical steps or frameworks that the audience can implement.","\u002Fsummaries\u002Fmrc-openai-s-protocol-for-resilient-ai-training-ne-summary","2026-05-07 07:50:02","2026-05-07 11:24:11",{"title":4749,"description":75},{"loc":4808},"30072e6e8b386729","MarkTechPost","https:\u002F\u002Fwww.marktechpost.com\u002F2026\u002F05\u002F07\u002Fopenai-introduces-mrc-multipath-reliable-connection-a-new-open-networking-protocol-for-large-scale-ai-supercomputer-training-clusters\u002F","summaries\u002Fmrc-openai-s-protocol-for-resilient-ai-training-ne-summary",[4818,99,100],"machine-learning","OpenAI's MRC extends RoCE with multipath spraying, microsecond failure recovery via SRv6, and multi-plane designs to deliver predictable performance in 131k-GPU clusters, using 2\u002F3 fewer optics and 3\u002F5 fewer switches than traditional setups.",[],"KdXLeYDvcUKvnCysl_vP3n1iwjXIrS3pZkFGBbn7k9g"]