/usr/lib/pd/extra/rtc/contrario.pd is in pd-rtclib 4.1-1.
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 | #N canvas 51 325 320 289 10;
#X obj 119 43 inlet;
#X obj 40 42 inlet;
#X obj 40 196 outlet;
#X obj 40 73 t f b;
#X obj 119 128 f \$1;
#X obj 40 165 expr $f2-$f1;
#X text 112 203 1993-2004 by Karlheinz Essl;
#X connect 0 0 4 0;
#X connect 1 0 3 0;
#X connect 3 0 5 0;
#X connect 3 1 4 0;
#X connect 4 0 5 1;
#X connect 5 0 2 0;
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