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/usr/share/gem/examples/13.recursion/stack.pd is in gem-doc 1:0.93.3-5ubuntu4.

This file is owned by root:root, with mode 0o644.

The actual contents of the file can be viewed below.

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#N canvas 0 0 351 366 10;
#X obj 25 19 inlet;
#X text 69 18 pop;
#X obj 166 18 inlet;
#X text 213 17 push;
#X obj 25 53 t b b;
#X obj 25 152 list prepend;
#X msg 88 127 0;
#X msg 121 127 1;
#X obj 25 183 route 0 1;
#X obj 25 251 list split 1;
#X obj 25 298 outlet;
#X obj 25 97 list;
#X text 79 298 popped;
#X obj 166 299 outlet;
#X text 220 298 empty;
#X obj 166 47 t b a b;
#X obj 109 217 list prepend;
#X obj 120 182 print stack-internal-error;
#X text 17 330 stack.pd (GPL) <claudiusmaximus@goto10.org>;
#X connect 0 0 4 0;
#X connect 2 0 15 0;
#X connect 4 0 11 0;
#X connect 4 1 6 0;
#X connect 5 0 8 0;
#X connect 6 0 5 1;
#X connect 7 0 5 1;
#X connect 8 0 9 0;
#X connect 8 1 16 0;
#X connect 8 2 17 0;
#X connect 9 0 10 0;
#X connect 9 1 11 1;
#X connect 9 2 13 0;
#X connect 11 0 5 0;
#X connect 15 0 11 0;
#X connect 15 1 16 1;
#X connect 15 2 7 0;
#X connect 16 0 11 1;