ai-agent-book 精选快照（<2MB 代码与文档，来自 github.com/bojieli/ai-agent-book）
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---
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theme: seriph
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title: "Lesson 14 — What Makes a Tool Easy for a Model to Use?"
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info: "English video course for AI Agents in Depth"
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author: Bojie Li
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transition: slide-left
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mdc: true
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lineNumbers: false
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monaco: false
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aspectRatio: 16/9
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canvasWidth: 980
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layout: cover
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class: cover
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---
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<div class="course-kicker">Build · Chapter 4 · Tools</div>
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# What Makes a Tool Easy for a Model to Use?
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<p class="course-subtitle">Capability boundaries, granularity, descriptions, and MCP</p>
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<div class="course-cover-meta">Lesson 14 of 42 · 18 minutes · Tool Classification; Universal Principles; MCP; Perception Tools</div>
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<!-- Presenter cue: Open with the concrete problem. Add personal context in your own words; do not read the slide. -->
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---
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<div class="course-kicker">Build · Chapter 4 · Tools</div>
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# Problems this chapter will solve
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<div class="grid grid-cols-3 gap-5 mt-6">
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<div class="course-card blue">
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<h3>Lesson 14</h3>
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<p>What Makes a Tool Easy for a Model to Use?</p>
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</div>
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<div class="course-card green">
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<h3>Lesson 15</h3>
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<p>How Do You Let an Agent Act Without Letting It Cause Damage?</p>
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</div>
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<div class="course-card purple">
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<h3>Lesson 16</h3>
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<p>When Should an Agent Ask for Help or Delegate?</p>
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</div>
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<div class="course-card blue">
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<h3>Lesson 17</h3>
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<p>How Can a Synchronous Model Live in an Asynchronous World?</p>
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</div>
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</div>
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<!-- Presenter cue: Orient viewers to the chapter. Name the progression, then highlight today's first problem. -->
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---
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# Why this problem matters
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<div class="grid grid-cols-3 gap-5 mt-6">
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<div class="course-card blue">
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<h3>Granularity</h3>
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<p>One broad tool or several composable operations?</p>
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</div>
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<div class="course-card green">
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<h3>Description</h3>
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<p>The model selects tools from names, schemas, and examples.</p>
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</div>
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<div class="course-card orange">
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<h3>Fidelity</h3>
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<p>Arguments must preserve the user's intended operation.</p>
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</div>
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</div>
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<!-- Presenter cue: Connect each card to a product or experiment consequence. -->
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---
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# Three ideas to keep in view
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<div class="grid grid-cols-3 gap-5 mt-6">
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<div class="course-card purple">
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<h3>Perception</h3>
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<p>Read the world without changing it</p>
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</div>
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<div class="course-card blue">
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<h3>Execution</h3>
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<p>Change state and create consequences</p>
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</div>
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<div class="course-card green">
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<h3>Collaboration</h3>
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<p>Reach another Agent or human</p>
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</div>
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</div>
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<!-- Presenter cue: Define unfamiliar terms in plain language; the audience is new to ML training and RL. -->
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---
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# The book's visual model
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<img class="course-figure" src="/images/fig4-1.svg" alt="MCP protocol interaction sequence">
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<div class="course-caption">MCP protocol interaction sequence</div>
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<!-- Presenter cue: Trace the diagram in one direction and name the mechanism that matters for this lesson. -->
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---
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# Dedicated tool vs. Skill + executor
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<div class="grid grid-cols-2 gap-6 mt-5">
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<div class="course-card orange"><h3>Dedicated tool</h3><ul><li>Clear intent</li><li>Narrow schema</li><li>Many definitions at scale</li></ul></div>
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<div class="course-card green"><h3>Skill + executor</h3><ul><li>General action surface</li><li>Instructions on demand</li><li>Needs stronger sandboxing</li></ul></div>
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</div>
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<div class="course-caption course-caption-strong">Capability expression is a design choice.</div>
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<!-- Presenter cue: Explain the trade-off; avoid presenting the right column as universally superior. -->
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---
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# A schema is an Agent-facing API
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~~~json
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{
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"name": "weather",
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"description": "Current observed weather for one place",
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"parameters": {"city": {"type": "string"}},
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"required": ["city"]
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}
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~~~
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<!-- Presenter cue: Walk through the executable idea line by line; keep implementation details for the terminal. -->
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---
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# Test the claim
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<div class="grid grid-cols-1 gap-4 mt-5">
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<div class="course-card blue">
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<div class="course-demo-head"><span>4-1</span><span>3 min</span></div>
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<h3>Discover and call perception tools</h3>
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<p><strong>Observe:</strong> Tool discovery, typed arguments, truncation, and evidence returned</p>
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</div>
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</div>
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<div class="course-caption course-caption-strong">Demo budget: 3 minutes · one contiguous terminal block</div>
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<!-- Presenter cue: State the prediction before running anything. Name the observation that could disconfirm it. -->
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---
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class: course-terminal
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---
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<div class="course-kicker">Live demo</div>
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# Switching to the terminal
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~~~bash
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$ uv run python chapter4/perception-tools/cli.py demo --offline
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~~~
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<div class="course-terminal-watch">Run the command(s), narrate decisions, and point to the observation—not just the output.</div>
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<!-- Presenter cue: Switch windows now. Return to the next slide after every listed experiment is complete. -->
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---
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# What the evidence supports
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<div class="grid grid-cols-3 gap-5 mt-6">
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<div class="course-card green">
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<h3>Finding 1</h3>
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<p>Read-only tools are easier to cache, parallelize, and trust.</p>
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</div>
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<div class="course-card blue">
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<h3>Finding 2</h3>
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<p>Descriptions should state scope, provenance, and failure behavior.</p>
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</div>
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<div class="course-card purple">
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<h3>Finding 3</h3>
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<p>MCP standardizes interoperability but not tool quality.</p>
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</div>
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</div>
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<!-- Presenter cue: Tie each finding to something viewers just observed; distinguish evidence from interpretation. -->
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---
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layout: center
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---
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<div class="course-kicker course-kicker-red">Where the claim stops</div>
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# Boundary condition
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<div class="course-boundary">Every third-party server creates a new trust boundary for descriptions, credentials, and returned content.</div>
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<!-- Presenter cue: Say explicitly what this experiment does not establish. -->
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---
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layout: center
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---
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<div class="course-kicker">Engineering takeaway</div>
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# Design rule
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<div class="course-rule">Design tools for faithful action and inspectable evidence before optimizing convenience.</div>
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<!-- Presenter cue: Present this as a reusable decision rule, then give one counterexample or trade-off. -->
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---
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# Continue the experiment
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<div class="grid grid-cols-2 gap-4 mt-6">
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<a class="course-link" href="../chapter4/perception-tools/">
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<span class="course-link-title">MCP server implementation</span>
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<span class="course-link-path">chapter4/perception-tools/</span>
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</a>
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<a class="course-link" href="../chapter4/DOCKER_DEPLOYMENT.md">
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<span class="course-link-title">Container deployment</span>
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<span class="course-link-path">chapter4/DOCKER_DEPLOYMENT.md</span>
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</a>
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<a class="course-link" href="../book-en/chapter4.md">
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<span class="course-link-title">Tool taxonomy</span>
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<span class="course-link-path">book-en/chapter4.md</span>
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</a>
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</div>
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<!-- Presenter cue: Point viewers to the companion paths; do not walk through every extension. -->
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---
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layout: center
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class: text-center
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---
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<div class="course-kicker">Pause and apply</div>
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# Your turn
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<div class="course-big course-reflection">Which parameter in your tool can silently change the meaning of the user's request?</div>
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<!-- Presenter cue: Invite viewers to pause the video. Offer your own answer after a short beat. -->
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---
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layout: center
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class: text-center
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---
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<div class="course-kicker">Next · Lesson 15</div>
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<div class="course-next">Add execution power without letting a model become the security boundary.</div>
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<div class="course-next-arrow">→</div>
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<!-- Presenter cue: Use this transition to make the course feel continuous rather than episodic. -->
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