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/usr/share/doc-base/ninja is in ninja-build-doc 1.5.1-0.1ubuntu1.

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The actual contents of the file can be viewed below.

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Document: ninja
Title: Ninja Documentation
Author: Gary Kramlich
Section: Programming/C++

Format: HTML
Index: /usr/share/doc/ninja-build-doc/html/index.html
Files: /usr/share/doc/ninja-build-doc/html/*