/usr/share/puredata/doc/5.reference/change-help.pd is in puredata-core 0.48.1-3.
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 | #N canvas 376 130 540 355 12;
#X msg 67 124 bang;
#X floatatom 67 266 0 0 0 0 - - -;
#X floatatom 79 154 0 0 0 0 - - -;
#X floatatom 104 182 0 0 0 0 - - -;
#X text 284 309 updated for Pd version 0.27;
#X text 173 239 creation argument initializes first value;
#X obj 57 15 change;
#X text 12 42 The change object outputs its input only when it changes.
You can "set" the current value \, or bang to force output.;
#X obj 67 240 change 6.5;
#X msg 105 211 set \$1;
#X text 136 183 set the value;
#X text 112 123 output current value;
#X text 110 154 if different from current value \, output and set;
#X obj 67 293 print;
#X text 114 16 - ELIMINATE REDUNDANCY IN A NUMBER STREAM;
#X connect 0 0 8 0;
#X connect 1 0 13 0;
#X connect 2 0 8 0;
#X connect 3 0 9 0;
#X connect 8 0 1 0;
#X connect 9 0 8 0;
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