/usr/share/doc/prover9-doc/examples/BA4.out is in prover9-doc 0.0.200902a-2.
This file is owned by root:root, with mode 0o644.
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1 2 3 4 5 | f(f(x,x),f(f(f(y,y),f(z,z)),f(f(y,y),f(z,z)))) = f(f(y,y),f(f(f(x,x),f(z,z)),f(f(x,x),f(z,z)))).
f(f(x,y),f(x,y)) = f(f(f(f(x,x),f(x,x)),f(f(y,y),f(y,y))),f(f(f(x,x),f(x,x)),f(f(y,y),f(y,y)))).
f(f(x,x),f(f(x,x),f(x,x))) = f(f(y,y),f(f(y,y),f(y,y))).
f(f(f(f(x,x),f(f(y,y),f(y,y))),f(f(x,x),f(y,y))),f(f(f(x,x),f(f(y,y),f(y,y))),f(f(x,x),f(y,y)))) = x.
% rewriter BA-Sheffer.demods: rewrote 4 terms with 17 rewrite steps in 0.01 seconds.
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