Exercise 1: Confirming Nothing New Is Needed — Possible Solution
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WHY NO NEW WORK IS REQUIRED
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Per this chapter, kanji's two original constraints were a fixed-depth
content hierarchy with no natural slot for individual characters, and
no self-contained-fragment convention for a page with inline markup.

THE TWO EARLIER CHAPTERS RESPONSIBLE
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Chapter 2's Drizzle schema has no depth limit built into it at all -
a page's own parentId can point arbitrarily deep, so a kanji path
fits exactly as naturally as any other page. Chapter 4's
set:html={page.body} renders any page's own stored HTML - including
a kanji page's own inline stroke-animation markup - through the
identical rendering path every other page on the site already uses.

WHY THIS WORKS AS AN ANSWER
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It correctly names both original constraints and correctly attributes
their resolution to Chapter 2 (the depth model) and Chapter 4
(rendering), confirming this chapter genuinely needs no new code to
solve either one.