/usr/lib/pd/extra/rtc/series-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 | #N canvas 358 313 516 413 10;
#X msg 110 102 a b c d;
#X msg 73 66 bang;
#X obj 73 166 series;
#X obj 73 282 print Random_Element;
#X obj 91 240 print Refill_Urn;
#X msg 134 149 1 2 3 4 5 6 7 8;
#X obj 97 223 bng 15 250 50 0 empty empty empty 0 -6 0 8 -262144 -1
-1;
#X obj 110 199 print Current_Index;
#X text 256 199 zero-based!;
#X msg 129 128 list x y z;
#X connect 0 0 2 1;
#X connect 1 0 2 0;
#X connect 2 0 3 0;
#X connect 2 1 4 0;
#X connect 2 1 6 0;
#X connect 2 2 7 0;
#X connect 5 0 2 1;
#X connect 9 0 2 1;
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