/usr/lib/pd/extra/list-abs/last-x.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 | #N canvas 417 318 464 379 10;
#X obj 265 147 inlet;
#X obj 179 149 inlet;
#X obj 179 253 outlet;
#X text 54 77 This is just a backwards compatibility wrapper around
list-lastx;
#X obj 179 206 list-lastx \$1;
#X connect 0 0 4 1;
#X connect 1 0 4 0;
#X connect 4 0 2 0;
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