/usr/share/puredata/doc/2.control.examples/21.markov.chain.pd is in puredata-doc 0.46.7-3.
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 msg 236 186 \; state 1;
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#X text 236 166 reset;
#X text 49 152 STEP;
#X text 34 20 Here is how to construct a simple \, three-valued Markov
chain using "random." Each time you click on "step" the previous output
("state") determines which of three random networks to invoke \, each
having a different probability distribution for the next value of "state."
For instance if the state was 3 \, the next state will be 1 70% of
the time \, state 2 10% \, and state 3 20%.;
#X text 408 422 updated for Pd version 0.35;
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