/usr/share/gem/examples/10.glsl/11.geometry.pd is in gem-doc 1:0.93.3-13.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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#X text 184 7 geometry shader;
#X text 48 28 The geometry shader is usefull to create new geometry
;
#X text 51 47 Here is an example where 40 circles are draw with 1 single
primitive.;
#X text 49 87 Be aware that the geometry shader is computed after the
vertex shader. coordinate are in 2d.;
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