/usr/share/puredata/doc/5.reference/route-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.
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#X obj 183 213 print x1;
#X obj 261 213 print x2;
#X obj 339 213 print x3;
#X obj 422 213 print x4;
#X obj 183 185 route 23 54 1;
#X msg 183 155 234 345 456;
#X msg 308 155 23 34 45;
#X msg 414 155 54 43;
#X msg 485 155 1 foo bar;
#X msg 254 247 impeach ringo starr;
#X obj 191 275 route big apple;
#X msg 435 248 apple pie;
#X msg 191 247 1 2 3;
#X msg 523 248 big apple pie;
#X msg 578 155 walk the dog;
#X text 45 33 Route checks the first element of a message against each
of its arguments \, which may be numbers or symbols (but not a mixture
of the two.);
#X text 44 85 If a match is found \, the rest of the message appears
on the corresponding outlet. If no match \, the message is repeated
to the last "rejection" outlet. The number of outlets is the number
of arguments plus one.;
#X text 19 185 numeric arguments:;
#X text 17 275 symbolic arguments:;
#X obj 157 489 print z1;
#X obj 233 489 print z2;
#X msg 124 424 bang;
#X msg 170 424 list;
#X msg 213 424 5;
#X msg 251 424 float 5;
#X msg 320 424 list 5;
#X msg 385 424 symbol pie;
#X msg 560 424 pie;
#X msg 483 424 list pie;
#X msg 70 424 1 2 3;
#X obj 157 461 route list float symbol bang;
#X obj 310 489 print z3;
#X obj 387 489 print z4;
#X obj 461 489 print z5;
#X obj 191 305 print y1;
#X obj 269 305 print y2;
#X obj 347 305 print y3;
#X text 76 344 To avoid confusion between \, say \, the number 5 and
the list containing only the number 5 \, both messages match "float"
\, and ditto for symbols. An empty list matches "bang". In Pd these
are all considered special cases of lists.;
#X text 97 9 - route messages according to their first element;
#X obj 43 8 route;
#X text 482 627 updated for Pd version 0.43;
#X obj 82 562 route 4;
#X msg 26 537 1 2 3;
#X floatatom 137 538 5 0 0 0 - - -, f 5;
#X msg 82 537 4 5 6;
#X obj 81 588 print w1;
#X obj 150 589 print w2;
#X text 210 547 With zero or one argument \, route sprouts an inlet
to set the argument (which may be float or symbol).;
#X connect 4 0 0 0;
#X connect 4 1 1 0;
#X connect 4 2 2 0;
#X connect 4 3 3 0;
#X connect 5 0 4 0;
#X connect 6 0 4 0;
#X connect 7 0 4 0;
#X connect 8 0 4 0;
#X connect 9 0 10 0;
#X connect 10 0 34 0;
#X connect 10 1 35 0;
#X connect 10 2 36 0;
#X connect 11 0 10 0;
#X connect 12 0 10 0;
#X connect 13 0 10 0;
#X connect 14 0 4 0;
#X connect 21 0 30 0;
#X connect 22 0 30 0;
#X connect 23 0 30 0;
#X connect 24 0 30 0;
#X connect 25 0 30 0;
#X connect 26 0 30 0;
#X connect 27 0 30 0;
#X connect 28 0 30 0;
#X connect 29 0 30 0;
#X connect 30 0 19 0;
#X connect 30 1 20 0;
#X connect 30 2 31 0;
#X connect 30 3 32 0;
#X connect 30 4 33 0;
#X connect 41 0 45 0;
#X connect 41 1 46 0;
#X connect 42 0 41 0;
#X connect 43 0 41 1;
#X connect 44 0 41 0;
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