/usr/share/gem/examples/02.advanced/ is in gem-doc 1:0.93.3-7.
This file is owned by root:root, with mode 0o755.
..
/usr/share/gem/examples/02.advanced/00.gemwin-subpatch.pd
/usr/share/gem/examples/02.advanced/01.Separator.pd
/usr/share/gem/examples/02.advanced/02.Ortho.pd
/usr/share/gem/examples/02.advanced/03.View.pd
/usr/share/gem/examples/02.advanced/03.View_OSD.pd
/usr/share/gem/examples/02.advanced/04.Fog.pd
/usr/share/gem/examples/02.advanced/05.Stereo.pd
/usr/share/gem/examples/02.advanced/06.StereoParticle.pd
/usr/share/gem/examples/02.advanced/07.Snapshot1.pd
/usr/share/gem/examples/02.advanced/08.Snapshot2.pd
/usr/share/gem/examples/02.advanced/09.SnapshotSave.pd
/usr/share/gem/examples/02.advanced/10.LinearPath.pd
/usr/share/gem/examples/02.advanced/11.SplinePath.pd
/usr/share/gem/examples/02.advanced/12.Hsv.pd
/usr/share/gem/examples/02.advanced/13.ModelRescale.pd
/usr/share/gem/examples/02.advanced/14.RenderOrder.pd
/usr/share/gem/examples/02.advanced/15.GemWin.pd
/usr/share/gem/examples/02.advanced/16.vertex_program.pd
/usr/share/gem/examples/02.advanced/17.fragment_program.pd
/usr/share/gem/examples/02.advanced/18.gl_shading_language.pd
/usr/share/gem/examples/02.advanced/19.pointer.pd
/usr/share/gem/examples/02.advanced/20.double-gemhead_vs_repeat.pd
/usr/share/gem/examples/02.advanced/21.basic_LSystem.pd
/usr/share/gem/examples/02.advanced/22.double-iterative.pd