/usr/lib/pd/extra/list-abs/list-rev-help.pd is in pd-list-abs 0.1-1.
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 21 22 23 | #N canvas 0 31 464 309 10;
#X msg 156 76 1 2 3 4;
#X obj 184 109 print Original;
#X obj 156 199 list-rev;
#X obj 184 164 print Reversed;
#X obj 183 230 print Rev_again;
#X text 127 35 list-rev: reverse a list's order.;
#X obj 156 131 list-rev;
#N canvas 472 161 494 396 META 0;
#X text 12 25 LICENSE SIBSD;
#X text 12 105 AUTHOR Frank Barknecht;
#X text 12 125 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 65 INLET_0 anything;
#X text 12 85 OUTLET_0 list;
#X text 12 45 DESCRIPTION reverse a list's order;
#X restore 393 268 pd META;
#X connect 0 0 1 0;
#X connect 0 0 6 0;
#X connect 2 0 4 0;
#X connect 6 0 2 0;
#X connect 6 0 3 0;
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