/usr/lib/pd/extra/mapping/quartic.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 22 23 | #N canvas 1 53 569 383 10;
#X obj 52 10 inlet;
#X obj 387 9 inlet;
#X obj 52 324 outlet;
#X obj 300 10 loadbang;
#X obj 227 9 inlet;
#X obj 227 50 purepd/float_argument \$1;
#X obj 387 50 purepd/float_argument \$2;
#X obj 227 95 -;
#X msg 227 73 1 \$1;
#X obj 52 159 expr (1-2*$f2)*pow($f1 \, 2) + (2*$f2)*$f1;
#X obj 52 190 expr (1-2*$f2)*pow($f1 \, 2) + (2*$f2)*$f1;
#X connect 0 0 9 0;
#X connect 1 0 6 0;
#X connect 3 0 5 0;
#X connect 3 0 6 0;
#X connect 4 0 5 0;
#X connect 5 0 8 0;
#X connect 6 0 10 1;
#X connect 7 0 9 1;
#X connect 8 0 7 0;
#X connect 9 0 10 0;
#X connect 10 0 2 0;
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