/usr/lib/pd/extra/purepd/delta-help.pd is in pd-purepd 0.1.1-2.
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 15 16 17 18 19 20 | #N canvas 328 264 466 318 12;
#X floatatom 54 217 5 0 0;
#X floatatom 54 108 5 0 0;
#X msg 23 83 bang;
#X text 69 82 calculate and output result now;
#X obj 54 172 delta;
#X obj 54 133 * 3;
#X floatatom 127 218 5 0 0;
#X floatatom 127 109 5 0 0;
#X obj 127 134 * 3;
#X obj 127 173 delta 2;
#X text 53 259 use creation arguments to set order (1st or 2nd);
#X text 39 20 delta :: calculate 1st or 2nd order difference;
#X connect 1 0 5 0;
#X connect 2 0 4 0;
#X connect 4 0 0 0;
#X connect 5 0 4 0;
#X connect 7 0 8 0;
#X connect 8 0 9 0;
#X connect 9 0 6 0;
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