/usr/lib/pd/extra/rtc/periodic-help.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 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 | #N canvas 222 211 647 533 10;
#X obj 153 255 bng 15 250 50 1 empty empty reset 0 -6 0 8 -261689 -1
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#X msg 42 316;
#X obj 42 270 collect;
#X text 27 -26 periodic;
#X text 27 6 Random number generator. The periodicity factor (float
between 0 and 1) determines the "periodicity" of the output \, i.e.
the probability of repetitions. A periodicity factor of 1 will result
in a completely periodic output (= constant repetition of a single
value) \, whereas a periodicity factor of 0 will result into a completely
unperiodic behaviour.;
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#X floatatom 92 205 0 0 0 2 upper_limit - -;
#X floatatom 142 205 0 0 0 0 - - -;
#X text 185 437 1995-98 by Karlheinz Essl;
#X text 144 -12 vs. 1.1;
#X obj 42 246 periodic 10 0.5;
#X obj 42 374 list prepend 0;
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#X array \$0-period 67 float 0;
#X coords 0 10 66 -1 300 100 1;
#X restore 301 159 graph;
#X obj 42 410 s \$0-period;
#X msg 153 374 const 0;
#X obj 142 121 vsl 15 64 0 1 0 0 empty empty periodicity_factor 0 -8
0 8 -262144 -1 -1 0 1;
#X obj 42 174 until;
#X obj 42 150 t a b;
#X text 600 245 - 0;
#X text 601 154 - 10;
#X obj 42 290 t b a;
#X msg 42 115 67;
#X obj 483 314 tabosc4~ \$0-period;
#X floatatom 483 295 5 0 0 0 - - -;
#X obj 483 336 -~ 5;
#X obj 482 390 dac~;
#X obj 482 360 *~ 0.01;
#X text 185 453 vs. 1.1: seedable by the RTC-seed object;
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