/usr/lib/pd/extra/pdp_invert.pd is in pd-pdp 1:0.12.5-1.1ubuntu1.
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 | #N canvas 487 324 440 275 10;
#X obj 34 51 inlet;
#X obj 34 236 outlet;
#X obj 34 173 pdp_gain;
#X obj 34 100 pdp_cheby 1;
#X obj 153 24 loadbang;
#X msg 141 146 chanmask 6;
#X msg 153 58 chanmask 1 \, coef 0 1 \, coef 1 -1;
#X msg 141 120 -1;
#X connect 0 0 3 0;
#X connect 2 0 1 0;
#X connect 3 0 2 0;
#X connect 4 0 6 0;
#X connect 5 0 2 0;
#X connect 6 0 3 0;
#X connect 6 0 7 0;
#X connect 7 0 2 1;
#X connect 7 0 5 0;
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