/usr/lib/pd/extra/rtc/pitch-from-intervals.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 15 16 17 | #N canvas 360 176 286 239 10;
#X obj 31 124 st2pitch;
#X obj 31 149 outlet;
#X obj 110 149 outlet;
#X obj 125 52 inlet;
#X obj 219 52 inlet;
#X obj 31 52 inlet;
#X text 30 186 1993 by Karlheinz Essl;
#X obj 31 81 sel-princ \$1;
#X obj 31 101 t a a;
#X connect 0 0 1 0;
#X connect 3 0 7 1;
#X connect 4 0 7 2;
#X connect 5 0 7 0;
#X connect 7 0 8 0;
#X connect 8 0 0 0;
#X connect 8 1 2 0;
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