# Amazon Nova 2 Sonic vs Rime Prism

> Amazon Nova 2 Sonic scores 67.6 (B) to Rime Prism's 59.7 (C) for voice agents. Prices, MCP, x402, uptime and agent notes side by side.

- Canonical: https://www.anchorterminal.com/compare/amazon-nova-sonic-vs-rime-prism
- Markdown: https://www.anchorterminal.com/compare/amazon-nova-sonic-vs-rime-prism.md (~6,100 tokens)
- Site index for agents: https://www.anchorterminal.com/llms.txt (the key docs and every listing in one file, at most 16 MB, about 4 million tokens: https://www.anchorterminal.com/llms-full.txt)
- API: https://www.anchorterminal.com/api/v1/index.json
- MCP: https://www.anchorterminal.com/mcp (the whole catalogue as tools, no key)
- DNS: dig +short TXT <slug>.grade.anchorterminal.com (the grade as a DNS TXT record, for a sandbox with no HTTP where names still resolve; also top., best.<category>. and <a>.vs.<b>. under the zone, and the same under grade.letme.dev)
- Licence: CC BY 4.0, credit Anchor Terminal and link this page (https://www.anchorterminal.com/terms/#data)
- Updated: 2026-11-07

Amazon Nova 2 Sonic scores 67.6 (B) on agent readiness against Rime Prism's 59.7 (C), and leads in 4 of 7 scored categories. Rime Prism leads on agent ergonomics, payments & pricing and maintenance & community. Both do voice agents.

- Amazon Nova 2 Sonic: grade B, 67.6/100, rank #314 of 1486. Markdown https://www.anchorterminal.com/tools/amazon-nova-sonic.md · JSON https://www.anchorterminal.com/api/v1/tools/amazon-nova-sonic.json
- Rime Prism: grade C, 59.7/100, rank #685 of 1486. Markdown https://www.anchorterminal.com/tools/rime-prism.md · JSON https://www.anchorterminal.com/api/v1/tools/rime-prism.json
- Best conversational voice-agent APIs: https://www.anchorterminal.com/best/voice-agents/index.md
- All 518 voice agents comparisons: https://www.anchorterminal.com/compare/voice-agents/index.md

## Which one, for what

### Amazon Nova 2 Sonic (B)

Good for: Voice agents on AWS, call centres on Amazon Connect, teams that want IAM and in-account data handling.

Ahead on:
- Reliability, 95 against 55
- Schema & documentation, 75 against 69
- Security & auth, 77 against 56
- Transparency & trust, 79 against 72

Watch for: Connections end after 8 minutes, so long calls need the session-continuation pattern

### Rime Prism (C)

Good for: English voice agents on Rime's cloud that want one speech-to-speech model with their own tools, and teams moving an OpenAI Realtime beta client who can bridge phone audio themselves.

Ahead on:
- Agent ergonomics, 73 against 64
- Payments & pricing, 40 against 10
- Maintenance & community, 75 against 50

Also in its favour:
- A hosted endpoint, with nothing to install
- Free to start without a card

Watch for: Rime's status page has no Prism component, so Prism has no incident history of its own


## Why the edge

### Reliability: Amazon Nova 2 Sonic +40

- Amazon Nova 2 Sonic (95): Hosted reading. AWS Health Dashboard with per-service, per-Region history (20). The dashboard history file (newest event 30 October 2026) lists no Bedrock event in the 90 days from 8 August, and the 3 September us-west-2 event names STS, Connect and IAM Identity Center, not Bedrock. The public dashboard records broad events only, so 25 of 30, as amazon-nova-embeddings was read. Quotas published, 20 concurrent requests per Region, not adjustable (15). The stream API lists `ThrottlingException` (429), `ServiceUnavailableException` (503), `ModelTimeoutException` (408) and `ModelStreamErrorException` (424), Bedrock's troubleshooting guide advises backoff with jitter, and the 8-minute connection limit comes with a session-continuation sample (15). Bedrock's SLA of 99.9 per cent a month per Region for model APIs, as read for amazon-nova-embeddings on 1 November (10). Generally available since 2 December 2025 (10). 20 + 25 + 15 + 15 + 10 + 10 = 95.
- Rime Prism (55): status.rime.ai redirects to an incident.io page at rimestat.us with Text-to-speech API and Platform API components, and still no Prism component on 4 November 2026. A vendor status page with no component for the product takes 15 in this run (15, was 10). Its feed lists two incidents, Text-to-speech partial degradations on 3 and 5 September, and nothing since Prism launched on 28 October, a short record of seven days (15, was 5). The errors page publishes per-session numbers (55 seconds a turn, 60 seconds of queued speech, 120 seconds or 512 tokens a reply, 5 minutes idle, 1 MiB a message), but no concurrency limit per account or key, and a full server answers 503. Partly met, so the earlier 8 is kept (8). Overload is documented as `capacity_exceeded`, `unavailable`, a 503 refusal ("Retry after a backoff") and close code 1001, the page says which reply failures can succeed when sent again, and the tools guide says never to rerun a call with an unknown outcome. Safe-retry guidance without idempotency keys gives 12 in this run (12, was 13, not a checklist value). SLAs are an Enterprise item and none is published (0). The changelog calls Prism available, but all four SDKs are 0.1.0 alpha releases, the Pipecat path uses a pinned preview, and the pricing page says half duplex at launch. Partly met, so the earlier 5 is kept (5). 15+15+8+12+0+5 = 55.

### Payments & pricing: Rime Prism +30

- Amazon Nova 2 Sonic (10): No x402, MPP or L402 (0). The Nova and Bedrock pricing pages carry a speech-to-speech table drawn by script, so the per-token prices weren't read and this line scores absent, which is our reader's limit and not the vendor's (0). New accounts get up to $200 in Free Tier credits, and the Free Tier FAQ says most new customers need no payment method, read as half on the other AWS listings (10). A person signs up for an AWS account in a browser (0). Total 10.
- Rime Prism (40): No x402, MPP or L402 (0). $0.080 a minute on Flex and $0.064 on Scale, published without a login, unchanged on 4 November (20). $50 of usage a month on the Free plan, Prism included, "No card required" (20). A person signs up in a browser to get a key (0). 0+20+20+0 = 40.

### Maintenance & community: Rime Prism +25

- Amazon Nova 2 Sonic (50): Read as a model. The newest dated change is the May 2026 refresh, completed on 28 May, 162 days before this check (10). No Sonic release note or document history entry in the 90 days from 8 August. The pre-alpha Python SDK shipped 0.9.0, 0.10.0, 0.11.0 and 0.12.0 in the window, counted half (10 of 20). Release notes, document history, re:Post and AWS Support (10 of 15). The JavaScript Bedrock runtime client is current at 3.1163.0, while the Python route is pre-alpha (10 of 15). The SDKs ship on AWS's release train; CI not read (10). Total 50.
- Rime Prism (75): Read as a closed API on the tool lines. Prism launched on 28 October 2026, and SDK releases that change the Python `realtime` client (Prism's) followed to 1 November (30). Since 6 August the changelog has one Prism entry (28 October), and the SDK repository tagged six releases that change Prism's realtime code, on 26 October (two), 27, 30 October (two) and 1 November, each across the Python, Node.js, Go and Rust packages. Counting SDK tags at half, that is four, so three or more (20, was 10). A public changelog with RSS, docs and community support on Free and email on paid plans, and a support address. Responsiveness can't yet be judged a week after launch (8 of 15). Current official SDKs in four languages, the newest on 3 November, all 0.1.0 alpha with a warning that a release can change the API. Partly met, so the earlier 12 is kept (12 of 15). The SDK repository is MIT, and its checks workflow on main runs pytest, npm test, ruff and mypy with locked dependencies, results unread (github.com answers 403). Partly met, so the earlier 5 is kept (5 of 10). Rime retired Arcana from its cloud API 17 days after announcing it (29 July to 15 August 2026). 30+20+8+12+5 = 75.

### Security & auth: Amazon Nova 2 Sonic +21

- Amazon Nova 2 Sonic (77): SigV4 with IAM roles and temporary credentials scoped per model ARN, as the Sonic quickstart signs (30). Tools run in the client, so side effects are the developer's to approve, and IAM can restrict which models a role invokes, with no approval step in the API (12 of 20). The model listens to callers and acts on tool results, and no prompt-injection guidance was found in the Sonic guide (5 of 15). CloudTrail logs Bedrock API calls, read as amazon-nova-embeddings was (12 of 15). VDP on HackerOne, Bedrock in SOC scope and a valid security.txt on aws.amazon.com, with no paid bounty, as on the other AWS listings (18 of 20). Total 77.
- Rime Prism (56): Graded as a hosted API. One Rime API key per request, sent as a Bearer header on the upgrade. Prism reads no query parameters and the docs say not to put the key in the URL. No scopes, no read-only keys and no ephemeral tokens for client devices were found, the same key also covers text-to-speech and speech-to-text, and rotation isn't described beyond creating tokens in the dashboard (20 of 30). `tool_choice` is `auto` only, so a backend can't force a call, but it can remove a tool mid-call with `session.update`. The prompting guide says Prism can call a tool before the caller confirms and to keep confirmation rules in tool code. The launch pages say every reply is text before speech so guardrails can check it, but the docs describe no step that holds a reply for checks (10 of 20). Prism takes untrusted caller audio and tool results. The docs say to confirm outcomes from the agent's own records, not the reply text, with no explicit prompt-injection guidance (6 of 15). Request, session and correlation IDs for support and token usage on each `response.done`. No per-call log or audit trail in the dashboard was found (6 of 15). SOC 2 Type II since May 2025, HIPAA compliance since February 2024 with an audit in March 2026, and a vulnerability disclosure policy linked from the security page. The security page still names a formal vulnerability disclosure programme on 4 November. security.txt answered 404 and no bug bounty was found (14 of 20). 20+10+6+6+14 = 56.

### Agent ergonomics: Rime Prism +9

- Amazon Nova 2 Sonic (64): Scored as an API. Responses carry transcripts of both sides and usage events, chat history is capped at 200 KB and can be injected once per session (15 of 25). Output controls are voice, turn-taking sensitivity and text or audio input (12 of 20). Typed exceptions with HTTP codes, while errors inside the event stream are less documented (15 of 20). Asynchronous tool calls let the model keep talking, and AWS samples show how to resume after the 8-minute limit, with nothing on repeating tool side effects after a reconnect (12 of 20). A session needs a sequence of start events before audio. The JavaScript SDK is current, but the Python SDK the quickstart uses is pre-alpha and needs Python 3.12 (10 of 15). Total 64.
- Rime Prism (73): Scored as a model API. A 65,536-token context, with `truncation` set to leave out the oldest turns by default, a configurable `retention_ratio`, a `prism_truncation` report on each reply, `prism.conversation.get` to read the stored history and `conversation.item.delete` to trim it (20 of 25). Replies are capped at 120 seconds or 512 tokens and can't be set lower. `max_response_output_tokens`, `temperature` and text-only replies are refused. Up to 16 labels per reply for routing. No lists to page. Partly met, so the earlier 8 is kept (8 of 20). Errors carry `code`, `scope`, `owner`, `param` and a `correlation_id`, and the docs tell clients to branch on code and scope, never on message (20). Client events are matched by `event_id`, a repeated identical tool result is acknowledged, and Prism records late results. Prism doesn't deduplicate requests, a dropped connection doesn't resume, and the client replays history into a new session. Partly met, so the earlier 12 is kept (12 of 20). Short instructions are enough to start, the voice defaults to `astra` and interruption is on. Official SDKs in Python, Node.js, Go and Rust, all alpha, plus LiveKit and Pipecat quickstarts. Partly met while the SDKs are alpha, so the earlier 13 is kept (13 of 15). 20+8+20+12+13 = 73.

### Transparency & trust: Amazon Nova 2 Sonic +7

- Amazon Nova 2 Sonic (79): Closed model under the AWS Service Terms, with Apache-2.0 SDKs and samples (15). Bedrock stores no inputs or outputs by default and model providers can't see them, Sonic isn't on the abuse-detection page's list of models whose traffic is stored, and section 50.3 doesn't list Bedrock among services whose content improves AWS services, as read for amazon-nova-embeddings on 1 November (22 of 30). Bedrock's lifecycle policy for models launched before 7 September 2026 promises 12 months and a Legacy period of at least 6 months, but the March and May refreshes changed the model in place under the same ID (15 of 20). Regions are listed, with sub-processors not read (12 of 20). Total 64.
- Rime Prism (72): Closed service with clear terms from Rime Labs, Inc., and the SDK is MIT (15 of 30). The terms changed on 29 October 2026. Section 6.3(b) now grants Rime a perpetual licence to train and improve its models on Free Plan customer data (excluding voice recordings, audio with a natural person's voice and third parties' personal data), while the privacy policy (effective 22 August 2025) says "We do not use customer data to train AI models unless explicitly requested and agreed upon" and the security page says "We never use customer text or audio to train our models". The privacy and security pages still describe text in and audio out, and none covers Prism's caller audio, while the new terms define Call Content and say not to send Caller audio on a Free Plan. The DPA at rime.ai/dpa couldn't be reached from our network on 28 October. The contradiction between the terms and the security page is charged once, as the misleading-claim deduction, so the line holds (15 of 30). The new terms promise at least 30 days' notice before retiring a Model Version used on a paid plan. Arcana's cloud retirement came with 17 days' notice before that policy (15 of 20, was 10). A sub-processor list with locations, all in the United States, and the Prism endpoint stated as US East (us-east-2), per the 28 October check (18 of 20). 15+15+15+18 = 63.

## Score by category

| Category | Weight | Amazon Nova 2 Sonic | Rime Prism | Edge |
| --- | --- | --- | --- | --- |
| Reliability | 16% (20 this run) | 95 | 55 | Amazon Nova 2 Sonic +40 |
| Performance | 10%, pending | pending | pending | not scored in this run |
| Schema & documentation | 13% (16.2 this run) | 75 | 69 | Amazon Nova 2 Sonic +6 |
| Agent ergonomics | 13% (16.2 this run) | 64 | 73 | Rime Prism +9 |
| Security & auth | 14% (17.5 this run) | 77 | 56 | Amazon Nova 2 Sonic +21 |
| Payments & pricing | 10% (12.5 this run) | 10 | 40 | Rime Prism +30 |
| Task success | 10%, pending | pending | pending | not scored in this run |
| Maintenance & community | 7% (8.8 this run) | 50 | 75 | Rime Prism +25 |
| Transparency & trust | 7% (8.8 this run) | 79 | 72 | Amazon Nova 2 Sonic +7 |
| Negative events | ≤15 | 0 | -2 | |
| **Total** | | **67.6 · B** | **59.7 · C** | |

## Facts side by side

| Fact | Amazon Nova 2 Sonic | Rime Prism |
| --- | --- | --- |
| Kind | HTTP API | HTTP API |
| Vendor | Amazon Web Services | Rime Labs |
| Hosted endpoint | no (local only) | `wss://prism.api.rime.ai/v1/realtime` |
| Transports | HTTP | websocket |
| Auth | API key | API key |
| Pricing | Pay per use | Freemium |
| x402 | no | no |
| Licence | none | Proprietary hosted service under Rime's terms. The Rime SDK used to call it (github.com/rimelabs/rime-sdk) is MIT. |
| Tools exposed | 0 | none |
| Read-only variant documented | no | no |
| llms.txt | yes | yes |
| Last release | 2026-05-28 | 2026-11-01 |
| Terms last updated | 2026-10-01 | no date given |
| Privacy policy last updated | 2026-05-18 | no date given |
| Customer content may train models | yes, with an opt-out | not found in the text |
| Terms restrict automated access | yes | not found in the text |
| Terms restrict benchmarking | yes | yes |
| Terms or service can change without notice | yes | not found in the text |
| Arbitration or class-action waiver | not found in the text | yes |

## How the scores have moved

### Amazon Nova 2 Sonic

No score change since it was listed.

### Rime Prism

- +1.8 on 4 November 2026: terms, product, correction, negative event

## Verdicts

**Amazon Nova 2 Sonic.** Nova 2 Sonic runs speech-to-speech conversations with asynchronous tools on Bedrock, with IAM scoping, no default storage of inputs and a 99.9 per cent SLA. Sessions cut off at 8 minutes, the Python SDK is pre-alpha, and the event payloads have no schema file. Prices are in a script-drawn table we couldn't read.

**Rime Prism.** Prism's WebSocket API documents typed events and 41 error codes with remedies, with a published per-minute price and $50 of free monthly usage. Rime's status page has no Prism component, no per-account concurrency limit is published, the SDKs are alpha, and the 29 October terms allow training on Free Plan data that the security page says never happens.

## Before you call either

### Amazon Nova 2 Sonic

1. Plan a reconnect before 8 minutes and replay chat history (up to 200 KB) at the start of the new session
2. Send session, prompt and content start events in order before any audio
3. Make tool calls safe to repeat, since a reconnect can replay them
4. Back off on `ThrottlingException` and stay within 20 concurrent sessions per Region
5. Use the polyglot voices TIFFANY or MATTHEW when callers may switch language

### Rime Prism

1. Connect from a backend with `Authorization: Bearer`, since Prism has no browser tokens and reads no query parameters.
2. Send `session.update` before any audio, or every append fails with `session_not_initialized`.
3. Keep streaming audio, silence included, while Prism speaks, because it finds turn ends and interruptions from that audio.
4. Ask for the continuation after each tool result, since Prism doesn't resume on its own, and never rerun a call with an unknown outcome.
5. Pin the exact SDK version, because the SDKs are alpha and a new release can change the API.
6. Don't send caller audio or personal data on the Free plan. The terms forbid it and allow training on Free Plan data.

## Questions

### Which is better for AI agents, Amazon Nova 2 Sonic or Rime Prism?

Amazon Nova 2 Sonic scores 67.6 (B) on agent readiness against Rime Prism's 59.7 (C), and leads in 4 of 7 scored categories. Rime Prism leads on agent ergonomics, payments & pricing and maintenance & community.

### Do Amazon Nova 2 Sonic and Rime Prism need an API key?

Both need an API key.

### Can an agent call Amazon Nova 2 Sonic and Rime Prism without installing anything?

No hosted endpoint is listed for Amazon Nova 2 Sonic. Rime Prism has a hosted endpoint at wss://prism.api.rime.ai/v1/realtime.


## For agents

- This comparison as JSON: https://www.anchorterminal.com/compare/amazon-nova-sonic-vs-rime-prism.json, and with the fewest tokens: https://www.anchorterminal.com/compare/amazon-nova-sonic-vs-rime-prism.min.md
- Over MCP at https://www.anchorterminal.com/mcp (no key): `compare_tools {"a": "amazon-nova-sonic", "b": "rime-prism"}`. From a terminal: `anchor compare amazon-nova-sonic rime-prism`
- Each listing in full: https://www.anchorterminal.com/api/v1/tools/amazon-nova-sonic.json and https://www.anchorterminal.com/api/v1/tools/rime-prism.json

## Other comparisons with Amazon Nova 2 Sonic or Rime Prism

- [Amazon Nova 2 Sonic vs AssemblyAI Voice Agent API](https://www.anchorterminal.com/compare/amazon-nova-sonic-vs-assemblyai-voice-agent.md)
- [Amazon Nova 2 Sonic vs Bland AI API + MCP](https://www.anchorterminal.com/compare/amazon-nova-sonic-vs-bland-ai.md)
- [Amazon Nova 2 Sonic vs Bolna API + MCP](https://www.anchorterminal.com/compare/amazon-nova-sonic-vs-bolna.md)
- [Amazon Nova 2 Sonic vs Deepgram Voice Agent API](https://www.anchorterminal.com/compare/amazon-nova-sonic-vs-deepgram-voice-agent.md)
- [Amazon Nova 2 Sonic vs ElevenLabs Agents API + MCP](https://www.anchorterminal.com/compare/amazon-nova-sonic-vs-elevenlabs-agents.md)
- [Amazon Nova 2 Sonic vs fone.me](https://www.anchorterminal.com/compare/amazon-nova-sonic-vs-fone-me.md)
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- [Amazon Nova 2 Sonic vs GPT-Live](https://www.anchorterminal.com/compare/amazon-nova-sonic-vs-gpt-live.md)
- [Amazon Nova 2 Sonic vs Harmony.ai](https://www.anchorterminal.com/compare/amazon-nova-sonic-vs-harmony-ai.md)
- [Amazon Nova 2 Sonic vs Hume EVI (Empathic Voice Interface)](https://www.anchorterminal.com/compare/amazon-nova-sonic-vs-hume-evi.md)
- [Amazon Nova 2 Sonic vs Inworld Realtime API](https://www.anchorterminal.com/compare/amazon-nova-sonic-vs-inworld-realtime.md)
- [Amazon Nova 2 Sonic vs LiveKit Agents](https://www.anchorterminal.com/compare/amazon-nova-sonic-vs-livekit-agents.md)
- [Amazon Nova 2 Sonic vs OpenAI Realtime API](https://www.anchorterminal.com/compare/amazon-nova-sonic-vs-openai-realtime.md)
- [Amazon Nova 2 Sonic vs Pipecat](https://www.anchorterminal.com/compare/amazon-nova-sonic-vs-pipecat.md)
- [Amazon Nova 2 Sonic vs PlaceCall](https://www.anchorterminal.com/compare/amazon-nova-sonic-vs-placecall.md)
- [Amazon Nova 2 Sonic vs Retell AI API + MCP](https://www.anchorterminal.com/compare/amazon-nova-sonic-vs-retell-ai.md)
- [Amazon Nova 2 Sonic vs Synthflow API + MCP](https://www.anchorterminal.com/compare/amazon-nova-sonic-vs-synthflow.md)
- [Amazon Nova 2 Sonic vs Ultravox Realtime API](https://www.anchorterminal.com/compare/amazon-nova-sonic-vs-ultravox.md)
- [Amazon Nova 2 Sonic vs Vaani Developer Platform](https://www.anchorterminal.com/compare/amazon-nova-sonic-vs-vaani-voice.md)
- [Amazon Nova 2 Sonic vs Vapi API + MCP](https://www.anchorterminal.com/compare/amazon-nova-sonic-vs-vapi.md)
- [Amazon Nova 2 Sonic vs Vocily AI](https://www.anchorterminal.com/compare/amazon-nova-sonic-vs-vocily.md)
- [Amazon Nova 2 Sonic vs Vogent API](https://www.anchorterminal.com/compare/amazon-nova-sonic-vs-vogent.md)
- [AssemblyAI Voice Agent API vs Rime Prism](https://www.anchorterminal.com/compare/assemblyai-voice-agent-vs-rime-prism.md)
- [Bland AI API + MCP vs Rime Prism](https://www.anchorterminal.com/compare/bland-ai-vs-rime-prism.md)
- [Bolna API + MCP vs Rime Prism](https://www.anchorterminal.com/compare/bolna-vs-rime-prism.md)
- [Deepgram Voice Agent API vs Rime Prism](https://www.anchorterminal.com/compare/deepgram-voice-agent-vs-rime-prism.md)
- [ElevenLabs Agents API + MCP vs Rime Prism](https://www.anchorterminal.com/compare/elevenlabs-agents-vs-rime-prism.md)
- [fone.me vs Rime Prism](https://www.anchorterminal.com/compare/fone-me-vs-rime-prism.md)
- [Gemini Live API vs Rime Prism](https://www.anchorterminal.com/compare/gemini-live-vs-rime-prism.md)
- [Harmony.ai vs Rime Prism](https://www.anchorterminal.com/compare/harmony-ai-vs-rime-prism.md)
- [Hume EVI (Empathic Voice Interface) vs Rime Prism](https://www.anchorterminal.com/compare/hume-evi-vs-rime-prism.md)
- [Inworld Realtime API vs Rime Prism](https://www.anchorterminal.com/compare/inworld-realtime-vs-rime-prism.md)
- [LiveKit Agents vs Rime Prism](https://www.anchorterminal.com/compare/livekit-agents-vs-rime-prism.md)
- [OpenAI Realtime API vs Rime Prism](https://www.anchorterminal.com/compare/openai-realtime-vs-rime-prism.md)
- [Pipecat vs Rime Prism](https://www.anchorterminal.com/compare/pipecat-vs-rime-prism.md)
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- [Rime Prism vs Vaani Developer Platform](https://www.anchorterminal.com/compare/rime-prism-vs-vaani-voice.md)
- [Rime Prism vs Vocily AI](https://www.anchorterminal.com/compare/rime-prism-vs-vocily.md)
- [Rime Prism vs Vogent API](https://www.anchorterminal.com/compare/rime-prism-vs-vogent.md)
- [GPT-Live vs Rime Prism](https://www.anchorterminal.com/compare/gpt-live-vs-rime-prism.md)
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