(VAR x y z)
(THEORY (AC p))
(RULES
p(x,zero) -> x
p(i(x),x) -> zero
m(one,x) -> x
m(x,one) -> x
m(d(x),x) -> one
m(x,m(y,z)) -> m(m(x,y),z)
m(z,p(x,y)) -> p(m(z,x),m(z,y))
m(p(x,y),z) -> p(m(x,z),m(y,z))
)