/usr/lib/pd/extra/list-abs/list-sub-help.pd is in pd-list-abs 0.1-3.
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 20 | #N canvas 0 31 450 300 10;
#X obj 145 177 list-sub;
#X msg 145 116 5 5 5 NOPE 5;
#X obj 145 217 print;
#X msg 196 141 1 2 3 0 -1;
#X text 108 67 Substract two lists element by element;
#N canvas 506 181 494 396 META 0;
#X text 12 25 LICENSE SIBSD;
#X text 12 145 HELP_PATCH_AUTHORS Frank Barknecht. "pd meta" information
added by Jonathan Wilkes for Pd version 0.42.;
#X text 12 5 KEYWORDS control list_op;
#X text 12 45 DESCRIPTION substract two lists element by element;
#X text 12 65 INLET_0 list;
#X text 12 85 INLET_1 list;
#X text 12 105 OUTLET_0 list;
#X text 12 125 AUTHOR Frank Barknecht;
#X restore 389 266 pd META;
#X connect 0 0 2 0;
#X connect 1 0 0 0;
#X connect 3 0 0 1;
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