/usr/lib/pd/extra/zexy/sum.pd is in pd-zexy 2.2.5-2.
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 21 22 23 24 25 26 27 28 29 30 31 32 33 | #N canvas 300 91 450 300 10;
#X obj 43 29 inlet;
#X obj 46 229 outlet;
#X obj 59 103 list split 1;
#X obj 59 67 until;
#X obj 59 85 list append;
#X obj 126 120 bang;
#X obj 59 138 route float;
#X obj 59 171 +;
#X obj 59 188 t f f;
#X obj 46 206 f;
#X msg 92 154 0;
#X obj 43 48 t b b l b;
#X text 289 21 part of zexy;
#X text 37 11 sum up a list of floats;
#X text 212 87 requires pd>=0.39;
#X connect 0 0 11 0;
#X connect 2 0 6 0;
#X connect 2 1 4 1;
#X connect 2 2 5 0;
#X connect 3 0 4 0;
#X connect 4 0 2 0;
#X connect 5 0 3 1;
#X connect 6 0 7 0;
#X connect 7 0 8 0;
#X connect 8 0 9 1;
#X connect 8 1 7 1;
#X connect 9 0 1 0;
#X connect 10 0 8 0;
#X connect 11 0 9 0;
#X connect 11 1 3 0;
#X connect 11 2 4 1;
#X connect 11 3 10 0;
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