/usr/lib/pd/extra/purepd/tanh.pd is in pd-purepd 0.1.1-1.
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 | #N canvas 129 16 457 303 10;
#X obj 105 29 inlet;
#X obj 105 119 t a a;
#X obj 105 73 * 2;
#X obj 105 94 exp;
#X obj 105 172 / 1;
#X obj 105 199 outlet;
#X obj 105 148 - 1;
#X obj 137 148 + 1;
#X text 289 97 exp(2x) - 1;
#X text 290 125 exp(2x) + 1;
#X text 240 109 tanh = -----------;
#X obj 105 51 f \$1;
#X connect 0 0 11 0;
#X connect 1 0 6 0;
#X connect 1 1 7 0;
#X connect 2 0 3 0;
#X connect 3 0 1 0;
#X connect 4 0 5 0;
#X connect 6 0 4 0;
#X connect 7 0 4 1;
#X connect 11 0 2 0;
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