/usr/lib/pd/extra/list-abs/list-math.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 | #N canvas 424 89 462 324 10;
#X obj 55 58 inlet;
#X obj 55 235 outlet;
#X text 44 16 Use as "list-math operator" where operator is some binary
operator \, expr can understand.;
#X obj 55 136 list-map;
#X obj 152 208 \$1 \$2;
#X obj 182 134 inlet;
#X obj 152 97 route float;
#X connect 0 0 3 0;
#X connect 3 0 1 0;
#X connect 3 1 6 0;
#X connect 4 0 3 1;
#X connect 5 0 4 1;
#X connect 6 0 4 0;
#X connect 6 1 3 1;
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