/usr/share/doc-base/sketch is in sketch-doc 1:0.3.7-6.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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Title: Debian sketch Manual
Author: Eugene K. Ressler Jr. <sketch@frontiernet.net>
Abstract: This manual describes the sketch 3D line drawing system
Section: Graphics
Format: PDF
Files: /usr/share/doc/sketch-doc/sketch.pdf.gz
Format: HTML
Index: /usr/share/doc/sketch-doc/sketch/index.html
Files: /usr/share/doc/sketch-doc/sketch/*.html
/usr/share/doc/sketch-doc/sketch/*.png
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