/usr/lib/pd/extra/rtc/subtr%.pd is in pd-rtclib 4.1-2.
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 141 72 368 247 10;
#X obj 249 30 inlet;
#X obj 49 164 outlet;
#X obj 49 68 t f b;
#X obj 49 30 inlet;
#X obj 198 98 float \$1;
#X obj 49 130 expr $f1 - $f2*$f1/100;
#X text 123 185 1993-99 by Karlheinz Essl;
#X connect 0 0 4 1;
#X connect 2 0 5 0;
#X connect 2 1 4 0;
#X connect 3 0 2 0;
#X connect 4 0 5 1;
#X connect 5 0 1 0;
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