/usr/lib/pd/extra/iemlib/ap2~.pd is in pd-iemlib 1.20.1-1.
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 22 42 inlet~;
#X obj 53 63 inlet;
#X obj 22 186 outlet~;
#X text 62 42 ~signal_in~;
#X obj 85 88 inlet;
#X text 184 113 <float> interpolation_time [ms];
#X text 32 153 ~filtered signal_out~;
#X obj 149 113 inlet;
#X text 121 88 <float> quality [-];
#X text 12 9 ap2~;
#X text 60 8 allpass 2.order;
#X text 89 65 <float> -180_degree_frequency [Hz];
#X obj 22 134 filter~ ap2 \$1 \$2 1 \$3;
#X text 82 174 1.arg: <float> -180_degree_frequency [Hz];
#X text 82 183 2.arg: <float> quality [-];
#X text 82 193 3.arg: <float> interpolation_time [ms] (opt.);
#X text 176 245 IEM KUG;
#X text 160 233 musil;
#X text 190 233 @;
#X text 196 233 iem.at;
#X text 111 222 (c) Thomas Musil 2000 - 2005;
#X text 159 255 Graz \, Austria;
#X connect 0 0 12 0;
#X connect 1 0 12 1;
#X connect 4 0 12 2;
#X connect 7 0 12 4;
#X connect 12 0 2 0;
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