/usr/lib/pd/extra/upp/upp.dynpatch.pd is in pd-upp 0.1-1.
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 | #N canvas 756 469 610 339 10;
#X obj 186 38 loadbang;
#X text 184 288 explicit loadbang after everything has been set up
;
#X obj 213 176 upp.dynchain;
#X obj 186 232 f \$0;
#N canvas 201 562 526 277 \$0-dynsub 0;
#X restore 44 199 pd \$0-dynsub;
#X msg 186 256 \; pd-\$1-dynsub loadbang;
#X obj 351 196 outlet;
#X obj 351 155 inlet;
#X text 349 213 index;
#X text 351 138 object to create (list);
#X text 276 31 create dynamically allocated object per message;
#X text 276 45 with no inlets and outlets;
#X obj 186 70 t b b;
#X obj 213 112 list append \$1 \$0-dynsub 0;
#X connect 0 0 12 0;
#X connect 2 1 6 0;
#X connect 3 0 5 0;
#X connect 7 0 2 1;
#X connect 12 0 3 0;
#X connect 12 1 13 0;
#X connect 13 0 2 0;
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