/usr/share/debmake/extra1patches/series is in debmake 4.0.7-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 | # This is manually managed by users with dquilt (quilt(1) wrapper)
# See http://www.debian.org/doc/manuals/maint-guide/modify.en.html#quiltrc
# Also this may be updated by dpkg-source(1) when making a package.
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