/usr/lib/pd/extra/mapping/last_n.pd is in pd-mapping 0.2.1-1.
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 | #N canvas 417 318 723 395 10;
#X floatatom 356 89 5 0 0 2 change-size - -;
#X obj 326 112 t f b;
#X text 378 110 first reset (b) \, then set new length (f).;
#X text 311 195 Right outlet is responsible to first fill the list
;
#X text 322 217 Left outlet then only lets the smaller list pass.;
#X obj 180 183 list;
#X obj 326 54 inlet;
#X obj 180 149 inlet;
#X obj 180 302 outlet;
#X obj 180 228 list split \$1;
#X connect 0 0 1 0;
#X connect 1 0 9 1;
#X connect 1 1 5 1;
#X connect 5 0 9 0;
#X connect 6 0 1 0;
#X connect 7 0 5 0;
#X connect 9 0 5 1;
#X connect 9 0 8 0;
#X connect 9 2 5 1;
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