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## Building across chapters
+The optional [interactive graph viewer](graph/README.md) is shared in `graph/`.
+Chapters 18–25 launch it with `make view` from the chapter directory.
+
The top-level Makefile runs each chapter's `tests`, `tags` (also `tag`),
`release`, or `lib` target. Start with `make lib` on a fresh checkout, then
`make tests`.