/usr/lib/pd/extra/jmmmp/prepent.pd is in pd-jmmmp 0.1.1-2.
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 | #N canvas 0 0 450 300 10;
#X obj 90 88 inlet;
#X obj 90 205 outlet;
#X obj 90 132 list prepend \$1;
#X obj 90 157 list trim;
#X obj 190 87 inlet;
#X connect 0 0 2 0;
#X connect 2 0 3 0;
#X connect 3 0 1 0;
#X connect 4 0 2 1;
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