/usr/lib/pd/extra/pmpd/examples/tut_link.pd is in pd-pmpd 0.9-4.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 | #N canvas 0 0 454 304 10;
#X obj 177 35 inlet;
#X obj 171 96 outlet;
#X obj 12 32 inlet;
#X obj 6 93 outlet;
#X msg 56 156 \$1 \$2 0;
#X obj 24 186 gemhead;
#X obj 26 210 curve 2;
#X msg 134 155 \$1 \$2 0;
#X obj 45 61 link2D tut_link 0 10 2.5 0.1;
#X connect 0 0 7 0;
#X connect 0 0 8 1;
#X connect 2 0 4 0;
#X connect 2 0 8 0;
#X connect 4 0 6 1;
#X connect 5 0 6 0;
#X connect 7 0 6 2;
#X connect 8 0 3 0;
#X connect 8 1 1 0;
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