f(f(x,x),f(x,y)) = x.
f(f(x,x),f(y,x)) = x.
f(f(x,y),f(x,x)) = x.
f(f(y,x),f(x,x)) = x.
f(f(x,x),f(y,f(y,y))) = x.
f(f(x,x),f(f(y,y),y)) = x.
f(f(y,f(y,y)),f(x,x)) = x.
f(f(f(y,y),y),f(x,x)) = x.
f(f(x,f(y,z)),f(x,z)) = x.
f(f(x,f(y,z)),f(z,x)) = x.
f(f(x,y),f(x,f(z,y))) = x.
f(f(x,y),f(x,f(y,z))) = x.
f(f(x,f(y,z)),f(x,y)) = x.
f(f(x,y),f(f(z,y),x)) = x.
f(f(x,f(y,z)),f(y,x)) = x.
f(f(x,y),f(f(y,z),x)) = x.
f(f(f(y,z),x),f(x,z)) = x.
f(f(f(y,z),x),f(z,x)) = x.
f(f(y,x),f(x,f(z,y))) = x.
f(f(y,x),f(x,f(y,z))) = x.
f(f(y,x),f(f(z,y),x)) = x.
f(f(y,x),f(f(y,z),x)) = x.
f(f(f(y,z),x),f(x,y)) = x.
f(f(f(y,z),x),f(y,x)) = x.
f(f(x,y),f(x,f(z,f(z,z)))) = x.
f(f(x,y),f(x,f(f(z,z),z))) = x.
f(f(x,y),f(f(z,f(z,z)),x)) = x.
f(f(x,y),f(f(f(z,z),z),x)) = x.
f(f(x,f(y,f(y,y))),f(x,z)) = x.
f(f(x,f(f(y,y),y)),f(x,z)) = x.
f(f(x,f(y,f(y,y))),f(z,x)) = x.
f(f(x,f(f(y,y),y)),f(z,x)) = x.
f(f(y,x),f(x,f(z,f(z,z)))) = x.
f(f(y,x),f(x,f(f(z,z),z))) = x.
f(f(y,x),f(f(z,f(z,z)),x)) = x.
f(f(y,x),f(f(f(z,z),z),x)) = x.
f(f(f(y,f(y,y)),x),f(x,z)) = x.
f(f(f(f(y,y),y),x),f(x,z)) = x.
f(f(f(y,f(y,y)),x),f(z,x)) = x.
f(f(f(f(y,y),y),x),f(z,x)) = x.
f(f(x,x),f(f(f(x,y),z),z)) = x.
f(f(x,x),f(f(f(y,x),z),z)) = x.
f(f(x,x),f(y,f(f(x,z),y))) = x.
f(f(x,x),f(f(y,f(x,z)),y)) = x.
f(f(x,x),f(y,f(f(z,x),y))) = x.
f(f(x,x),f(f(y,f(z,x)),y)) = x.
f(f(x,x),f(y,f(y,f(x,z)))) = x.
f(f(x,f(f(x,y),y)),f(x,z)) = x.
f(f(x,x),f(y,f(y,f(z,x)))) = x.
f(f(x,f(f(x,y),y)),f(z,x)) = x.
f(f(x,y),f(x,f(f(x,z),z))) = x.
f(f(x,y),f(x,f(z,f(x,z)))) = x.
f(f(x,y),f(x,f(f(z,x),z))) = x.
f(f(x,y),f(x,f(z,f(z,x)))) = x.
f(f(x,y),f(f(f(x,z),z),x)) = x.
f(f(x,y),f(f(z,f(x,z)),x)) = x.
f(f(x,y),f(f(f(z,x),z),x)) = x.
f(f(x,y),f(f(z,f(z,x)),x)) = x.
f(f(f(f(x,y),z),z),f(x,x)) = x.
f(f(x,f(y,f(x,y))),f(x,z)) = x.
f(f(x,f(f(y,x),y)),f(x,z)) = x.
f(f(x,f(y,f(x,y))),f(z,x)) = x.
f(f(x,f(f(y,x),y)),f(z,x)) = x.
f(f(x,f(y,f(y,x))),f(x,z)) = x.
f(f(f(f(x,y),y),x),f(x,z)) = x.
f(f(x,f(y,f(y,x))),f(z,x)) = x.
f(f(f(f(x,y),y),x),f(z,x)) = x.
f(f(y,x),f(x,f(f(x,z),z))) = x.
f(f(y,x),f(x,f(z,f(x,z)))) = x.
f(f(y,x),f(x,f(f(z,x),z))) = x.
f(f(y,x),f(x,f(z,f(z,x)))) = x.
f(f(y,x),f(f(f(x,z),z),x)) = x.
f(f(y,x),f(f(z,f(x,z)),x)) = x.
f(f(y,x),f(f(f(z,x),z),x)) = x.
f(f(y,x),f(f(z,f(z,x)),x)) = x.
f(f(f(f(y,x),z),z),f(x,x)) = x.
f(f(y,f(f(x,z),y)),f(x,x)) = x.
f(f(f(y,f(x,z)),y),f(x,x)) = x.
f(f(f(y,f(x,y)),x),f(x,z)) = x.
f(f(f(f(y,x),y),x),f(x,z)) = x.
f(f(f(y,f(x,y)),x),f(z,x)) = x.
f(f(f(f(y,x),y),x),f(z,x)) = x.
f(f(y,f(f(z,x),y)),f(x,x)) = x.
f(f(f(y,f(z,x)),y),f(x,x)) = x.
f(f(f(y,f(y,x)),x),f(x,z)) = x.
f(f(f(y,f(y,x)),x),f(z,x)) = x.
f(f(y,f(y,f(x,z))),f(x,x)) = x.
f(f(y,f(y,f(z,x))),f(x,x)) = x.
f(f(x,f(f(x,x),y)),f(x,z)) = x.
f(f(x,f(f(x,x),y)),f(z,x)) = x.
f(f(f(f(x,x),y),x),f(x,z)) = x.
f(f(f(f(x,x),y),x),f(z,x)) = x.
f(f(x,y),f(x,f(f(x,x),z))) = x.
f(f(x,f(y,f(x,x))),f(x,z)) = x.
f(f(x,y),f(f(f(x,x),z),x)) = x.
f(f(x,f(y,f(x,x))),f(z,x)) = x.
f(f(x,y),f(x,f(z,f(x,x)))) = x.
f(f(x,y),f(f(z,f(x,x)),x)) = x.
f(f(y,x),f(x,f(f(x,x),z))) = x.
f(f(f(y,f(x,x)),x),f(x,z)) = x.
f(f(y,x),f(f(f(x,x),z),x)) = x.
f(f(f(y,f(x,x)),x),f(z,x)) = x.
f(f(y,x),f(x,f(z,f(x,x)))) = x.
f(f(y,x),f(f(z,f(x,x)),x)) = x.
f(f(x,f(y,f(y,y))),f(z,f(z,z))) = x.
f(f(x,f(f(y,y),y)),f(z,f(z,z))) = x.
f(f(x,f(y,f(y,y))),f(f(z,z),z)) = x.
f(f(x,f(f(y,y),y)),f(f(z,z),z)) = x.
f(f(f(y,f(y,y)),x),f(z,f(z,z))) = x.
f(f(f(f(y,y),y),x),f(z,f(z,z))) = x.
f(f(f(y,f(y,y)),x),f(f(z,z),z)) = x.
f(f(f(f(y,y),y),x),f(f(z,z),z)) = x.
f(f(y,f(y,y)),f(x,f(z,f(z,z)))) = x.
f(f(y,f(y,y)),f(x,f(f(z,z),z))) = x.
f(f(f(y,y),y),f(x,f(z,f(z,z)))) = x.
f(f(f(y,y),y),f(x,f(f(z,z),z))) = x.
f(f(y,f(y,y)),f(f(z,f(z,z)),x)) = x.
f(f(y,f(y,y)),f(f(f(z,z),z),x)) = x.
f(f(f(y,y),y),f(f(z,f(z,z)),x)) = x.
f(f(f(y,y),y),f(f(f(z,z),z),x)) = x.
f(f(x,x),f(f(f(y,f(z,z)),z),z)) = x.
f(f(x,x),f(y,f(f(z,f(y,y)),y))) = x.
f(f(x,x),f(f(y,f(z,f(y,y))),y)) = x.
f(f(x,x),f(y,f(y,f(z,f(y,y))))) = x.
f(f(x,x),f(f(f(f(y,y),z),y),y)) = x.
f(f(x,x),f(y,f(f(f(y,y),z),y))) = x.
f(f(x,x),f(f(y,f(f(y,y),z)),y)) = x.
f(f(x,x),f(y,f(y,f(f(y,y),z)))) = x.
f(f(x,f(y,z)),f(f(f(x,z),z),z)) = x.
f(f(x,f(y,z)),f(z,f(f(x,z),z))) = x.
f(f(x,f(y,z)),f(f(z,f(x,z)),z)) = x.
f(f(x,f(y,z)),f(f(f(z,x),z),z)) = x.
f(f(x,f(y,z)),f(z,f(z,f(x,z)))) = x.
f(f(x,f(y,z)),f(z,f(f(z,x),z))) = x.
f(f(x,f(y,z)),f(f(z,f(z,x)),z)) = x.
f(f(x,f(y,z)),f(z,f(z,f(z,x)))) = x.
f(f(x,f(y,z)),f(f(f(x,y),y),y)) = x.
f(f(x,f(y,z)),f(y,f(f(x,y),y))) = x.
f(f(x,f(y,z)),f(f(y,f(x,y)),y)) = x.
f(f(x,f(y,z)),f(f(f(y,x),y),y)) = x.
f(f(x,f(y,z)),f(y,f(y,f(x,y)))) = x.
f(f(x,f(y,z)),f(y,f(f(y,x),y))) = x.
f(f(x,f(y,z)),f(f(y,f(y,x)),y)) = x.
f(f(x,f(y,z)),f(y,f(y,f(y,x)))) = x.
f(f(f(f(x,y),y),y),f(x,f(z,y))) = x.
f(f(f(f(x,y),y),y),f(x,f(y,z))) = x.
f(f(f(f(x,y),y),y),f(f(z,y),x)) = x.
f(f(f(f(x,y),y),y),f(f(y,z),x)) = x.
f(f(f(y,z),x),f(f(f(x,z),z),z)) = x.
f(f(f(y,z),x),f(z,f(f(x,z),z))) = x.
f(f(f(y,z),x),f(f(z,f(x,z)),z)) = x.
f(f(f(y,z),x),f(f(f(z,x),z),z)) = x.
f(f(f(y,z),x),f(z,f(z,f(x,z)))) = x.
f(f(f(y,z),x),f(z,f(f(z,x),z))) = x.
f(f(f(y,z),x),f(f(z,f(z,x)),z)) = x.
f(f(f(y,z),x),f(z,f(z,f(z,x)))) = x.
f(f(f(f(y,f(z,z)),z),z),f(x,x)) = x.
f(f(y,f(f(x,y),y)),f(x,f(z,y))) = x.
f(f(f(y,f(x,y)),y),f(x,f(z,y))) = x.
f(f(f(f(y,x),y),y),f(x,f(z,y))) = x.
f(f(y,f(f(x,y),y)),f(x,f(y,z))) = x.
f(f(f(y,f(x,y)),y),f(x,f(y,z))) = x.
f(f(f(f(y,x),y),y),f(x,f(y,z))) = x.
f(f(y,f(f(x,y),y)),f(f(z,y),x)) = x.
f(f(f(y,f(x,y)),y),f(f(z,y),x)) = x.
f(f(f(f(y,x),y),y),f(f(z,y),x)) = x.
f(f(y,f(f(x,y),y)),f(f(y,z),x)) = x.
f(f(f(y,f(x,y)),y),f(f(y,z),x)) = x.
f(f(f(f(y,x),y),y),f(f(y,z),x)) = x.
f(f(f(y,z),x),f(f(f(x,y),y),y)) = x.
f(f(f(y,z),x),f(y,f(f(x,y),y))) = x.
f(f(f(y,z),x),f(f(y,f(x,y)),y)) = x.
f(f(f(y,z),x),f(f(f(y,x),y),y)) = x.
f(f(f(y,z),x),f(y,f(y,f(x,y)))) = x.
f(f(f(y,z),x),f(y,f(f(y,x),y))) = x.
f(f(f(y,z),x),f(f(y,f(y,x)),y)) = x.
f(f(f(y,z),x),f(y,f(y,f(y,x)))) = x.
f(f(y,f(f(z,f(y,y)),y)),f(x,x)) = x.
f(f(f(y,f(z,f(y,y))),y),f(x,x)) = x.
f(f(y,f(y,f(x,y))),f(x,f(z,y))) = x.
f(f(y,f(f(y,x),y)),f(x,f(z,y))) = x.
f(f(f(y,f(y,x)),y),f(x,f(z,y))) = x.
f(f(y,f(y,f(x,y))),f(x,f(y,z))) = x.
f(f(y,f(f(y,x),y)),f(x,f(y,z))) = x.
f(f(f(y,f(y,x)),y),f(x,f(y,z))) = x.
f(f(y,f(y,f(x,y))),f(f(z,y),x)) = x.
f(f(y,f(f(y,x),y)),f(f(z,y),x)) = x.
f(f(f(y,f(y,x)),y),f(f(z,y),x)) = x.
f(f(y,f(y,f(x,y))),f(f(y,z),x)) = x.
f(f(y,f(f(y,x),y)),f(f(y,z),x)) = x.
f(f(f(y,f(y,x)),y),f(f(y,z),x)) = x.
f(f(y,f(y,f(z,f(y,y)))),f(x,x)) = x.
f(f(f(f(f(y,y),z),y),y),f(x,x)) = x.
f(f(y,f(y,f(y,x))),f(x,f(z,y))) = x.
f(f(y,f(y,f(y,x))),f(x,f(y,z))) = x.
f(f(y,f(y,f(y,x))),f(f(z,y),x)) = x.
f(f(y,f(y,f(y,x))),f(f(y,z),x)) = x.
f(f(y,f(f(f(y,y),z),y)),f(x,x)) = x.
f(f(f(y,f(f(y,y),z)),y),f(x,x)) = x.
f(f(y,f(y,f(f(y,y),z))),f(x,x)) = x.
f(f(x,x),f(y,f(y,f(z,f(z,z))))) = x.
f(f(x,x),f(y,f(y,f(f(z,z),z)))) = x.
f(f(x,x),f(f(f(y,f(y,z)),z),z)) = x.
f(f(x,f(f(x,y),y)),f(z,f(z,z))) = x.
f(f(x,f(f(x,y),y)),f(f(z,z),z)) = x.
f(f(x,x),f(f(f(y,f(z,y)),z),z)) = x.
f(f(x,x),f(f(f(f(y,z),y),z),z)) = x.
f(f(x,x),f(y,f(f(z,f(z,z)),y))) = x.
f(f(x,x),f(y,f(f(f(z,z),z),y))) = x.
f(f(x,x),f(f(y,f(z,f(z,z))),y)) = x.
f(f(x,x),f(f(y,f(f(z,z),z)),y)) = x.
f(f(x,x),f(y,f(f(z,f(z,y)),y))) = x.
f(f(x,x),f(f(y,f(z,f(z,y))),y)) = x.
f(f(x,x),f(f(f(f(y,z),z),y),y)) = x.
f(f(x,x),f(y,f(f(z,f(y,z)),y))) = x.
f(f(x,x),f(y,f(f(f(z,y),z),y))) = x.
f(f(x,x),f(f(y,f(z,f(y,z))),y)) = x.
f(f(x,x),f(f(y,f(f(z,y),z)),y)) = x.
f(f(x,x),f(y,f(y,f(z,f(z,y))))) = x.
f(f(x,x),f(y,f(f(f(y,z),z),y))) = x.
f(f(x,x),f(f(y,f(f(y,z),z)),y)) = x.
f(f(x,x),f(y,f(y,f(z,f(y,z))))) = x.
f(f(x,x),f(y,f(y,f(f(z,y),z)))) = x.
f(f(x,x),f(y,f(y,f(f(y,z),z)))) = x.
f(f(x,x),f(f(f(y,f(y,y)),z),z)) = x.
f(f(x,x),f(f(f(f(y,y),y),z),z)) = x.
f(f(x,f(y,f(x,y))),f(z,f(z,z))) = x.
f(f(x,f(f(y,x),y)),f(z,f(z,z))) = x.
f(f(x,f(y,f(x,y))),f(f(z,z),z)) = x.
f(f(x,f(f(y,x),y)),f(f(z,z),z)) = x.
f(f(x,f(y,f(y,x))),f(z,f(z,z))) = x.
f(f(f(f(x,y),y),x),f(z,f(z,z))) = x.
f(f(x,f(y,f(y,x))),f(f(z,z),z)) = x.
f(f(f(f(x,y),y),x),f(f(z,z),z)) = x.
f(f(x,f(y,z)),f(f(f(x,y),z),z)) = x.
f(f(x,f(y,z)),f(f(f(y,x),z),z)) = x.
f(f(f(f(x,y),z),z),f(x,f(y,z))) = x.
f(f(x,f(y,z)),f(z,f(f(x,y),z))) = x.
f(f(x,f(y,z)),f(f(z,f(x,y)),z)) = x.
f(f(f(f(x,y),z),z),f(x,f(z,y))) = x.
f(f(x,f(y,z)),f(z,f(f(y,x),z))) = x.
f(f(x,f(y,z)),f(f(z,f(y,x)),z)) = x.
f(f(f(f(x,y),z),z),f(f(y,z),x)) = x.
f(f(x,f(y,z)),f(z,f(z,f(x,y)))) = x.
f(f(f(f(x,y),z),z),f(f(z,y),x)) = x.
f(f(x,f(y,z)),f(z,f(z,f(y,x)))) = x.
f(f(x,f(y,z)),f(f(f(x,z),y),y)) = x.
f(f(x,f(y,z)),f(f(f(z,x),y),y)) = x.
f(f(x,f(y,z)),f(y,f(f(x,z),y))) = x.
f(f(x,f(y,z)),f(f(y,f(x,z)),y)) = x.
f(f(x,f(y,z)),f(y,f(f(z,x),y))) = x.
f(f(x,f(y,z)),f(f(y,f(z,x)),y)) = x.
f(f(x,f(y,z)),f(y,f(y,f(x,z)))) = x.
f(f(x,f(y,z)),f(y,f(y,f(z,x)))) = x.
f(f(f(y,f(x,y)),x),f(z,f(z,z))) = x.
f(f(f(f(y,x),y),x),f(z,f(z,z))) = x.
f(f(f(y,f(x,y)),x),f(f(z,z),z)) = x.
f(f(f(f(y,x),y),x),f(f(z,z),z)) = x.
f(f(f(f(y,x),z),z),f(x,f(y,z))) = x.
f(f(f(f(y,x),z),z),f(x,f(z,y))) = x.
f(f(f(f(y,x),z),z),f(f(y,z),x)) = x.
f(f(f(f(y,x),z),z),f(f(z,y),x)) = x.
f(f(f(y,f(y,x)),x),f(z,f(z,z))) = x.
f(f(f(y,f(y,x)),x),f(f(z,z),z)) = x.
f(f(y,f(y,f(z,f(z,z)))),f(x,x)) = x.
f(f(y,f(y,f(f(z,z),z))),f(x,x)) = x.
f(f(f(f(y,f(y,z)),z),z),f(x,x)) = x.
f(f(f(y,z),x),f(f(f(x,y),z),z)) = x.
f(f(f(y,z),x),f(f(f(y,x),z),z)) = x.
f(f(f(y,z),x),f(z,f(f(x,y),z))) = x.
f(f(f(y,z),x),f(f(z,f(x,y)),z)) = x.
f(f(f(y,z),x),f(z,f(f(y,x),z))) = x.
f(f(f(y,z),x),f(f(z,f(y,x)),z)) = x.
f(f(f(y,z),x),f(z,f(z,f(x,y)))) = x.
f(f(f(y,z),x),f(z,f(z,f(y,x)))) = x.
f(f(f(f(y,f(z,y)),z),z),f(x,x)) = x.
f(f(f(f(f(y,z),y),z),z),f(x,x)) = x.
f(f(y,f(f(z,f(z,z)),y)),f(x,x)) = x.
f(f(y,f(f(f(z,z),z),y)),f(x,x)) = x.
f(f(f(y,f(z,f(z,z))),y),f(x,x)) = x.
f(f(f(y,f(f(z,z),z)),y),f(x,x)) = x.
f(f(y,f(f(x,z),y)),f(x,f(z,y))) = x.
f(f(f(y,f(x,z)),y),f(x,f(z,y))) = x.
f(f(y,f(f(x,z),y)),f(x,f(y,z))) = x.
f(f(f(y,f(x,z)),y),f(x,f(y,z))) = x.
f(f(y,f(f(x,z),y)),f(f(z,y),x)) = x.
f(f(f(y,f(x,z)),y),f(f(z,y),x)) = x.
f(f(y,f(f(x,z),y)),f(f(y,z),x)) = x.
f(f(f(y,f(x,z)),y),f(f(y,z),x)) = x.
f(f(f(y,z),x),f(f(f(x,z),y),y)) = x.
f(f(f(y,z),x),f(f(f(z,x),y),y)) = x.
f(f(y,f(f(z,x),y)),f(x,f(z,y))) = x.
f(f(f(y,f(z,x)),y),f(x,f(z,y))) = x.
f(f(f(y,z),x),f(y,f(f(x,z),y))) = x.
f(f(f(y,z),x),f(f(y,f(x,z)),y)) = x.
f(f(y,f(f(z,x),y)),f(x,f(y,z))) = x.
f(f(f(y,f(z,x)),y),f(x,f(y,z))) = x.
f(f(f(y,z),x),f(y,f(f(z,x),y))) = x.
f(f(f(y,z),x),f(f(y,f(z,x)),y)) = x.
f(f(y,f(f(z,x),y)),f(f(z,y),x)) = x.
f(f(f(y,f(z,x)),y),f(f(z,y),x)) = x.
f(f(f(y,z),x),f(y,f(y,f(x,z)))) = x.
f(f(y,f(f(z,x),y)),f(f(y,z),x)) = x.
f(f(f(y,f(z,x)),y),f(f(y,z),x)) = x.
f(f(f(y,z),x),f(y,f(y,f(z,x)))) = x.
f(f(y,f(f(z,f(z,y)),y)),f(x,x)) = x.
f(f(f(y,f(z,f(z,y))),y),f(x,x)) = x.
f(f(f(f(f(y,z),z),y),y),f(x,x)) = x.
f(f(y,f(f(z,f(y,z)),y)),f(x,x)) = x.
f(f(y,f(f(f(z,y),z),y)),f(x,x)) = x.
f(f(f(y,f(z,f(y,z))),y),f(x,x)) = x.
f(f(f(y,f(f(z,y),z)),y),f(x,x)) = x.
f(f(y,f(y,f(x,z))),f(x,f(z,y))) = x.
f(f(y,f(y,f(x,z))),f(x,f(y,z))) = x.
f(f(y,f(y,f(x,z))),f(f(z,y),x)) = x.
f(f(y,f(y,f(x,z))),f(f(y,z),x)) = x.
f(f(y,f(y,f(z,x))),f(x,f(z,y))) = x.
f(f(y,f(y,f(z,x))),f(x,f(y,z))) = x.
f(f(y,f(y,f(z,x))),f(f(z,y),x)) = x.
f(f(y,f(y,f(z,x))),f(f(y,z),x)) = x.
f(f(y,f(y,f(z,f(z,y)))),f(x,x)) = x.
f(f(y,f(f(f(y,z),z),y)),f(x,x)) = x.
f(f(f(y,f(f(y,z),z)),y),f(x,x)) = x.
f(f(y,f(y,f(z,f(y,z)))),f(x,x)) = x.
f(f(y,f(y,f(f(z,y),z))),f(x,x)) = x.
f(f(y,f(y,y)),f(x,f(f(x,z),z))) = x.
f(f(f(y,y),y),f(x,f(f(x,z),z))) = x.
f(f(y,f(y,y)),f(x,f(z,f(x,z)))) = x.
f(f(y,f(y,y)),f(x,f(f(z,x),z))) = x.
f(f(f(y,y),y),f(x,f(z,f(x,z)))) = x.
f(f(f(y,y),y),f(x,f(f(z,x),z))) = x.
f(f(y,f(y,y)),f(x,f(z,f(z,x)))) = x.
f(f(y,f(y,y)),f(f(f(x,z),z),x)) = x.
f(f(f(y,y),y),f(x,f(z,f(z,x)))) = x.
f(f(f(y,y),y),f(f(f(x,z),z),x)) = x.
f(f(y,f(y,y)),f(f(z,f(x,z)),x)) = x.
f(f(y,f(y,y)),f(f(f(z,x),z),x)) = x.
f(f(f(y,y),y),f(f(z,f(x,z)),x)) = x.
f(f(f(y,y),y),f(f(f(z,x),z),x)) = x.
f(f(y,f(y,f(f(y,z),z))),f(x,x)) = x.
f(f(f(f(y,f(y,y)),z),z),f(x,x)) = x.
f(f(f(f(f(y,y),y),z),z),f(x,x)) = x.
f(f(y,f(y,y)),f(f(z,f(z,x)),x)) = x.
f(f(f(y,y),y),f(f(z,f(z,x)),x)) = x.
f(f(x,f(f(x,x),y)),f(z,f(z,z))) = x.
f(f(x,f(f(x,x),y)),f(f(z,z),z)) = x.
f(f(f(f(x,x),y),x),f(z,f(z,z))) = x.
f(f(f(f(x,x),y),x),f(f(z,z),z)) = x.
f(f(f(f(x,x),y),y),f(x,f(z,y))) = x.
f(f(f(f(x,x),y),y),f(x,f(y,z))) = x.
f(f(f(f(x,x),y),y),f(f(z,y),x)) = x.
f(f(f(f(x,x),y),y),f(f(y,z),x)) = x.
f(f(x,f(y,f(x,x))),f(z,f(z,z))) = x.
f(f(x,f(y,f(x,x))),f(f(z,z),z)) = x.
f(f(x,f(y,z)),f(f(f(x,x),z),z)) = x.
f(f(x,f(y,z)),f(z,f(f(x,x),z))) = x.
f(f(x,f(y,z)),f(f(z,f(x,x)),z)) = x.
f(f(x,f(y,z)),f(z,f(z,f(x,x)))) = x.
f(f(x,f(y,z)),f(f(f(x,x),y),y)) = x.
f(f(x,f(y,z)),f(y,f(f(x,x),y))) = x.
f(f(x,f(y,z)),f(f(y,f(x,x)),y)) = x.
f(f(x,f(y,z)),f(y,f(y,f(x,x)))) = x.
f(f(f(y,f(x,x)),x),f(z,f(z,z))) = x.
f(f(f(y,f(x,x)),x),f(f(z,z),z)) = x.
f(f(f(y,z),x),f(f(f(x,x),z),z)) = x.
f(f(f(y,z),x),f(z,f(f(x,x),z))) = x.
f(f(f(y,z),x),f(f(z,f(x,x)),z)) = x.
f(f(f(y,z),x),f(z,f(z,f(x,x)))) = x.
f(f(y,f(f(x,x),y)),f(x,f(z,y))) = x.
f(f(f(y,f(x,x)),y),f(x,f(z,y))) = x.
f(f(y,f(f(x,x),y)),f(x,f(y,z))) = x.
f(f(f(y,f(x,x)),y),f(x,f(y,z))) = x.
f(f(y,f(f(x,x),y)),f(f(z,y),x)) = x.
f(f(f(y,f(x,x)),y),f(f(z,y),x)) = x.
f(f(y,f(f(x,x),y)),f(f(y,z),x)) = x.
f(f(f(y,f(x,x)),y),f(f(y,z),x)) = x.
f(f(f(y,z),x),f(f(f(x,x),y),y)) = x.
f(f(f(y,z),x),f(y,f(f(x,x),y))) = x.
f(f(f(y,z),x),f(f(y,f(x,x)),y)) = x.
f(f(f(y,z),x),f(y,f(y,f(x,x)))) = x.
f(f(y,f(y,f(x,x))),f(x,f(z,y))) = x.
f(f(y,f(y,f(x,x))),f(x,f(y,z))) = x.
f(f(y,f(y,f(x,x))),f(f(z,y),x)) = x.
f(f(y,f(y,f(x,x))),f(f(y,z),x)) = x.
f(f(y,f(y,y)),f(x,f(f(x,x),z))) = x.
f(f(f(y,y),y),f(x,f(f(x,x),z))) = x.
f(f(y,f(y,y)),f(f(f(x,x),z),x)) = x.
f(f(f(y,y),y),f(f(f(x,x),z),x)) = x.
f(f(y,f(y,y)),f(x,f(z,f(x,x)))) = x.
f(f(f(y,y),y),f(x,f(z,f(x,x)))) = x.
f(f(y,f(y,y)),f(f(z,f(x,x)),x)) = x.
f(f(f(y,y),y),f(f(z,f(x,x)),x)) = x.
f(f(x,f(y,z)),f(x,f(u,f(z,z)))) = x.
f(f(x,f(y,z)),f(x,f(f(z,z),u))) = x.
f(f(x,f(y,z)),f(f(u,f(z,z)),x)) = x.
f(f(x,f(y,f(z,z))),f(x,f(u,z))) = x.
f(f(x,f(y,f(z,z))),f(x,f(z,u))) = x.
f(f(x,f(y,f(z,z))),f(f(u,z),x)) = x.
f(f(x,f(y,f(z,z))),f(f(z,u),x)) = x.
f(f(x,f(y,z)),f(f(f(z,z),u),x)) = x.
f(f(x,f(y,z)),f(x,f(u,f(y,y)))) = x.
f(f(x,f(y,z)),f(x,f(f(y,y),u))) = x.
f(f(x,f(y,z)),f(f(u,f(y,y)),x)) = x.
f(f(x,f(y,z)),f(f(f(y,y),u),x)) = x.
f(f(x,f(f(y,y),z)),f(x,f(u,y))) = x.
f(f(x,f(f(y,y),z)),f(x,f(y,u))) = x.
f(f(x,f(f(y,y),z)),f(f(u,y),x)) = x.
f(f(x,f(f(y,y),z)),f(f(y,u),x)) = x.
f(f(f(y,z),x),f(x,f(u,f(z,z)))) = x.
f(f(f(y,z),x),f(x,f(f(z,z),u))) = x.
f(f(f(y,z),x),f(f(u,f(z,z)),x)) = x.
f(f(f(y,z),x),f(f(f(z,z),u),x)) = x.
f(f(f(y,f(z,z)),x),f(x,f(u,z))) = x.
f(f(f(y,f(z,z)),x),f(x,f(z,u))) = x.
f(f(f(y,f(z,z)),x),f(f(u,z),x)) = x.
f(f(f(y,f(z,z)),x),f(f(z,u),x)) = x.
f(f(f(y,z),x),f(x,f(u,f(y,y)))) = x.
f(f(f(y,z),x),f(x,f(f(y,y),u))) = x.
f(f(f(y,z),x),f(f(u,f(y,y)),x)) = x.
f(f(f(y,z),x),f(f(f(y,y),u),x)) = x.
f(f(f(f(y,y),z),x),f(x,f(u,y))) = x.
f(f(f(f(y,y),z),x),f(x,f(y,u))) = x.
f(f(f(f(y,y),z),x),f(f(u,y),x)) = x.
f(f(f(f(y,y),z),x),f(f(y,u),x)) = x.
f(f(x,f(y,z)),f(x,f(f(z,u),u))) = x.
f(f(x,f(y,z)),f(x,f(u,f(z,u)))) = x.
f(f(x,f(y,z)),f(x,f(f(u,z),u))) = x.
f(f(x,f(y,z)),f(x,f(u,f(u,z)))) = x.
f(f(x,f(y,z)),f(f(f(z,u),u),x)) = x.
f(f(x,f(y,f(z,u))),f(x,f(u,z))) = x.
f(f(x,f(y,z)),f(f(u,f(z,u)),x)) = x.
f(f(x,f(y,z)),f(f(f(u,z),u),x)) = x.
f(f(x,f(f(f(y,z),u),u)),f(x,z)) = x.
f(f(x,f(y,f(z,u))),f(f(u,z),x)) = x.
f(f(x,f(f(f(y,z),u),u)),f(z,x)) = x.
f(f(x,f(y,z)),f(f(u,f(u,z)),x)) = x.
f(f(x,y),f(x,f(f(f(z,y),u),u))) = x.
f(f(x,y),f(x,f(f(f(y,z),u),u))) = x.
f(f(x,y),f(x,f(z,f(f(u,y),z)))) = x.
f(f(x,y),f(x,f(f(z,f(u,y)),z))) = x.
f(f(x,y),f(x,f(z,f(f(y,u),z)))) = x.
f(f(x,y),f(x,f(f(z,f(y,u)),z))) = x.
f(f(x,y),f(x,f(z,f(z,f(u,y))))) = x.
f(f(x,y),f(x,f(z,f(z,f(y,u))))) = x.
f(f(x,f(y,z)),f(x,f(f(y,u),u))) = x.
f(f(x,f(y,z)),f(x,f(u,f(y,u)))) = x.
f(f(x,f(y,z)),f(x,f(f(u,y),u))) = x.
f(f(x,f(y,z)),f(x,f(u,f(u,y)))) = x.
f(f(x,y),f(f(f(f(z,y),u),u),x)) = x.
f(f(x,f(y,z)),f(f(f(y,u),u),x)) = x.
f(f(x,f(y,f(f(z,u),y))),f(x,u)) = x.
f(f(x,f(f(y,f(z,u)),y)),f(x,u)) = x.
f(f(x,f(y,f(f(z,u),y))),f(u,x)) = x.
f(f(x,f(f(y,f(z,u)),y)),f(u,x)) = x.
f(f(x,f(y,z)),f(f(u,f(y,u)),x)) = x.
f(f(x,f(y,z)),f(f(f(u,y),u),x)) = x.
f(f(x,f(f(f(y,z),u),u)),f(x,y)) = x.
f(f(x,f(f(f(y,z),u),u)),f(y,x)) = x.
f(f(x,f(y,z)),f(f(u,f(u,y)),x)) = x.
f(f(x,f(y,f(y,f(z,u)))),f(x,u)) = x.
f(f(x,y),f(f(f(f(y,z),u),u),x)) = x.
f(f(x,f(y,f(y,f(z,u)))),f(u,x)) = x.
f(f(x,f(y,f(y,z))),f(x,f(u,z))) = x.
f(f(x,f(y,f(y,z))),f(x,f(z,u))) = x.
f(f(x,f(y,f(y,f(z,u)))),f(x,z)) = x.
f(f(x,f(y,f(y,z))),f(f(u,z),x)) = x.
f(f(x,f(y,f(y,f(z,u)))),f(z,x)) = x.
f(f(x,f(y,f(y,z))),f(f(z,u),x)) = x.
f(f(x,f(y,z)),f(x,f(u,f(z,y)))) = x.
f(f(x,f(y,z)),f(x,f(f(z,y),u))) = x.
f(f(x,f(f(y,z),u)),f(x,f(z,y))) = x.
f(f(x,f(y,f(f(z,u),y))),f(x,z)) = x.
f(f(x,f(f(y,f(z,u)),y)),f(x,z)) = x.
f(f(x,y),f(f(z,f(f(u,y),z)),x)) = x.
f(f(x,y),f(f(f(z,f(u,y)),z),x)) = x.
f(f(x,f(y,f(f(z,u),y))),f(z,x)) = x.
f(f(x,f(f(y,f(z,u)),y)),f(z,x)) = x.
f(f(x,f(f(y,z),u)),f(f(z,y),x)) = x.
f(f(x,f(y,z)),f(f(u,f(z,y)),x)) = x.
f(f(x,f(y,f(z,y))),f(x,f(u,z))) = x.
f(f(x,f(f(y,z),y)),f(x,f(u,z))) = x.
f(f(x,f(y,f(z,y))),f(x,f(z,u))) = x.
f(f(x,f(f(y,z),y)),f(x,f(z,u))) = x.
f(f(x,y),f(f(z,f(f(y,u),z)),x)) = x.
f(f(x,y),f(f(f(z,f(y,u)),z),x)) = x.
f(f(x,f(y,f(z,y))),f(f(u,z),x)) = x.
f(f(x,f(f(y,z),y)),f(f(u,z),x)) = x.
f(f(x,f(y,f(z,y))),f(f(z,u),x)) = x.
f(f(x,f(f(y,z),y)),f(f(z,u),x)) = x.
f(f(x,f(f(y,z),z)),f(x,f(u,y))) = x.
f(f(x,f(f(y,z),z)),f(x,f(y,u))) = x.
f(f(x,y),f(f(z,f(z,f(u,y))),x)) = x.
f(f(x,f(f(y,z),z)),f(f(u,y),x)) = x.
f(f(x,y),f(f(z,f(z,f(y,u))),x)) = x.
f(f(x,f(f(y,z),z)),f(f(y,u),x)) = x.
f(f(x,f(y,z)),f(f(f(z,y),u),x)) = x.
f(f(f(y,z),x),f(x,f(f(z,u),u))) = x.
f(f(f(y,z),x),f(x,f(u,f(z,u)))) = x.
f(f(f(y,z),x),f(x,f(f(u,z),u))) = x.
f(f(f(y,z),x),f(x,f(u,f(u,z)))) = x.
f(f(f(y,z),x),f(f(f(z,u),u),x)) = x.
f(f(f(y,z),x),f(f(u,f(z,u)),x)) = x.
f(f(f(y,z),x),f(f(f(u,z),u),x)) = x.
f(f(f(y,z),x),f(f(u,f(u,z)),x)) = x.
f(f(f(y,f(z,u)),x),f(x,f(u,z))) = x.
f(f(f(y,f(z,u)),x),f(f(u,z),x)) = x.
f(f(f(f(f(y,z),u),u),x),f(x,z)) = x.
f(f(f(f(f(y,z),u),u),x),f(z,x)) = x.
f(f(y,x),f(x,f(f(f(z,y),u),u))) = x.
f(f(y,x),f(x,f(f(f(y,z),u),u))) = x.
f(f(y,x),f(x,f(z,f(f(u,y),z)))) = x.
f(f(y,x),f(x,f(f(z,f(u,y)),z))) = x.
f(f(y,x),f(x,f(z,f(f(y,u),z)))) = x.
f(f(y,x),f(x,f(f(z,f(y,u)),z))) = x.
f(f(y,x),f(x,f(z,f(z,f(u,y))))) = x.
f(f(y,x),f(x,f(z,f(z,f(y,u))))) = x.
f(f(y,x),f(f(f(f(z,y),u),u),x)) = x.
f(f(y,x),f(f(f(f(y,z),u),u),x)) = x.
f(f(y,x),f(f(z,f(f(u,y),z)),x)) = x.
f(f(y,x),f(f(f(z,f(u,y)),z),x)) = x.
f(f(y,x),f(f(z,f(f(y,u),z)),x)) = x.
f(f(y,x),f(f(f(z,f(y,u)),z),x)) = x.
f(f(y,x),f(f(z,f(z,f(u,y))),x)) = x.
f(f(y,x),f(f(z,f(z,f(y,u))),x)) = x.
f(f(f(y,z),x),f(x,f(f(y,u),u))) = x.
f(f(f(y,z),x),f(x,f(u,f(y,u)))) = x.
f(f(f(y,z),x),f(x,f(f(u,y),u))) = x.
f(f(f(y,z),x),f(x,f(u,f(u,y)))) = x.
f(f(f(y,z),x),f(f(f(y,u),u),x)) = x.
f(f(f(y,z),x),f(f(u,f(y,u)),x)) = x.
f(f(f(y,z),x),f(f(f(u,y),u),x)) = x.
f(f(f(y,z),x),f(f(u,f(u,y)),x)) = x.
f(f(f(y,f(f(z,u),y)),x),f(x,u)) = x.
f(f(f(f(y,f(z,u)),y),x),f(x,u)) = x.
f(f(f(y,f(f(z,u),y)),x),f(u,x)) = x.
f(f(f(f(y,f(z,u)),y),x),f(u,x)) = x.
f(f(f(f(f(y,z),u),u),x),f(x,y)) = x.
f(f(f(f(f(y,z),u),u),x),f(y,x)) = x.
f(f(f(y,f(y,f(z,u))),x),f(x,u)) = x.
f(f(f(y,f(y,f(z,u))),x),f(u,x)) = x.
f(f(f(y,f(y,z)),x),f(x,f(u,z))) = x.
f(f(f(y,f(y,z)),x),f(x,f(z,u))) = x.
f(f(f(y,f(y,z)),x),f(f(u,z),x)) = x.
f(f(f(y,f(y,z)),x),f(f(z,u),x)) = x.
f(f(f(y,f(y,f(z,u))),x),f(x,z)) = x.
f(f(f(y,f(y,f(z,u))),x),f(z,x)) = x.
f(f(f(y,z),x),f(x,f(u,f(z,y)))) = x.
f(f(f(y,z),x),f(x,f(f(z,y),u))) = x.
f(f(f(y,z),x),f(f(u,f(z,y)),x)) = x.
f(f(f(y,z),x),f(f(f(z,y),u),x)) = x.
f(f(f(f(y,z),u),x),f(x,f(z,y))) = x.
f(f(f(f(y,z),u),x),f(f(z,y),x)) = x.
f(f(f(y,f(f(z,u),y)),x),f(x,z)) = x.
f(f(f(f(y,f(z,u)),y),x),f(x,z)) = x.
f(f(f(y,f(f(z,u),y)),x),f(z,x)) = x.
f(f(f(f(y,f(z,u)),y),x),f(z,x)) = x.
f(f(f(y,f(z,y)),x),f(x,f(u,z))) = x.
f(f(f(f(y,z),y),x),f(x,f(u,z))) = x.
f(f(f(y,f(z,y)),x),f(x,f(z,u))) = x.
f(f(f(f(y,z),y),x),f(x,f(z,u))) = x.
f(f(f(y,f(z,y)),x),f(f(u,z),x)) = x.
f(f(f(f(y,z),y),x),f(f(u,z),x)) = x.
f(f(f(y,f(z,y)),x),f(f(z,u),x)) = x.
f(f(f(f(y,z),y),x),f(f(z,u),x)) = x.
f(f(f(f(y,z),z),x),f(x,f(u,y))) = x.
f(f(f(f(y,z),z),x),f(x,f(y,u))) = x.
f(f(f(f(y,z),z),x),f(f(u,y),x)) = x.
f(f(f(f(y,z),z),x),f(f(y,u),x)) = x.
f(f(x,f(f(x,f(y,z)),u)),f(x,z)) = x.
f(f(x,f(f(x,f(y,z)),u)),f(z,x)) = x.
f(f(x,f(f(x,y),z)),f(x,f(u,y))) = x.
f(f(x,f(f(x,y),z)),f(x,f(y,u))) = x.
f(f(x,f(f(x,f(y,z)),u)),f(x,y)) = x.
f(f(x,f(f(x,y),z)),f(f(u,y),x)) = x.
f(f(x,f(f(x,f(y,z)),u)),f(y,x)) = x.
f(f(x,f(f(x,y),z)),f(f(y,u),x)) = x.
f(f(x,f(y,f(x,f(z,u)))),f(x,u)) = x.
f(f(x,f(y,f(x,f(z,u)))),f(u,x)) = x.
f(f(x,f(y,f(x,z))),f(x,f(u,z))) = x.
f(f(x,f(y,f(x,z))),f(x,f(z,u))) = x.
f(f(x,f(y,f(x,f(z,u)))),f(x,z)) = x.
f(f(x,f(y,f(x,z))),f(f(u,z),x)) = x.
f(f(x,f(y,f(x,f(z,u)))),f(z,x)) = x.
f(f(x,f(y,f(x,z))),f(f(z,u),x)) = x.
f(f(x,f(y,f(f(z,u),x))),f(x,u)) = x.
f(f(x,f(y,f(f(z,u),x))),f(u,x)) = x.
f(f(x,f(y,f(z,x))),f(x,f(u,z))) = x.
f(f(x,f(y,f(z,x))),f(x,f(z,u))) = x.
f(f(x,f(y,z)),f(x,f(f(x,z),u))) = x.
f(f(x,f(f(f(y,z),x),u)),f(x,z)) = x.
f(f(x,f(y,z)),f(x,f(u,f(x,z)))) = x.
f(f(x,f(y,f(z,x))),f(f(u,z),x)) = x.
f(f(x,f(f(f(y,z),x),u)),f(z,x)) = x.
f(f(x,f(y,z)),f(x,f(u,f(z,x)))) = x.
f(f(x,f(y,z)),f(x,f(f(z,x),u))) = x.
f(f(x,f(y,f(z,x))),f(f(z,u),x)) = x.
f(f(x,f(y,z)),f(f(f(x,z),u),x)) = x.
f(f(x,f(y,f(f(z,u),x))),f(x,z)) = x.
f(f(f(f(x,f(y,z)),u),x),f(x,z)) = x.
f(f(x,f(y,f(f(z,u),x))),f(z,x)) = x.
f(f(f(f(x,f(y,z)),u),x),f(z,x)) = x.
f(f(x,f(y,z)),f(f(u,f(x,z)),x)) = x.
f(f(x,f(y,z)),f(f(u,f(z,x)),x)) = x.
f(f(x,f(y,z)),f(f(f(z,x),u),x)) = x.
f(f(x,y),f(x,f(f(x,f(z,y)),u))) = x.
f(f(x,y),f(x,f(f(x,f(y,z)),u))) = x.
f(f(x,y),f(x,f(z,f(x,f(u,y))))) = x.
f(f(x,f(f(y,x),z)),f(x,f(u,y))) = x.
f(f(x,y),f(x,f(z,f(x,f(y,u))))) = x.
f(f(x,f(f(y,x),z)),f(x,f(y,u))) = x.
f(f(x,y),f(x,f(z,f(f(u,y),x)))) = x.
f(f(x,f(f(y,x),z)),f(f(u,y),x)) = x.
f(f(x,y),f(x,f(f(f(z,y),x),u))) = x.
f(f(x,y),f(x,f(z,f(f(y,u),x)))) = x.
f(f(x,y),f(f(f(x,f(z,y)),u),x)) = x.
f(f(x,f(f(y,x),z)),f(f(y,u),x)) = x.
f(f(x,y),f(x,f(f(f(y,z),x),u))) = x.
f(f(x,y),f(f(f(x,f(y,z)),u),x)) = x.
f(f(f(f(x,y),z),x),f(x,f(u,y))) = x.
f(f(f(f(x,y),z),x),f(x,f(y,u))) = x.
f(f(x,f(y,z)),f(x,f(f(x,y),u))) = x.
f(f(x,f(f(f(y,z),x),u)),f(x,y)) = x.
f(f(x,f(y,z)),f(x,f(u,f(x,y)))) = x.
f(f(x,y),f(f(z,f(x,f(u,y))),x)) = x.
f(f(f(f(x,y),z),x),f(f(u,y),x)) = x.
f(f(x,f(f(f(y,z),x),u)),f(y,x)) = x.
f(f(x,f(y,z)),f(x,f(u,f(y,x)))) = x.
f(f(x,f(y,z)),f(x,f(f(y,x),u))) = x.
f(f(x,y),f(f(z,f(x,f(y,u))),x)) = x.
f(f(f(f(x,y),z),x),f(f(y,u),x)) = x.
f(f(x,f(y,z)),f(f(f(x,y),u),x)) = x.
f(f(f(f(x,f(y,z)),u),x),f(x,y)) = x.
f(f(f(f(x,f(y,z)),u),x),f(y,x)) = x.
f(f(x,f(y,z)),f(f(u,f(x,y)),x)) = x.
f(f(x,y),f(f(z,f(f(u,y),x)),x)) = x.
f(f(x,f(y,z)),f(f(u,f(y,x)),x)) = x.
f(f(x,y),f(f(f(f(z,y),x),u),x)) = x.
f(f(x,f(y,z)),f(f(f(y,x),u),x)) = x.
f(f(x,y),f(f(z,f(f(y,u),x)),x)) = x.
f(f(x,y),f(f(f(f(y,z),x),u),x)) = x.
f(f(f(y,f(x,f(z,u))),x),f(x,u)) = x.
f(f(f(y,f(x,f(z,u))),x),f(u,x)) = x.
f(f(f(y,f(x,z)),x),f(x,f(u,z))) = x.
f(f(f(y,f(x,z)),x),f(x,f(z,u))) = x.
f(f(f(y,f(x,z)),x),f(f(u,z),x)) = x.
f(f(f(y,f(x,z)),x),f(f(z,u),x)) = x.
f(f(f(y,f(x,f(z,u))),x),f(x,z)) = x.
f(f(f(y,f(x,f(z,u))),x),f(z,x)) = x.
f(f(f(y,f(f(z,u),x)),x),f(x,u)) = x.
f(f(f(y,f(f(z,u),x)),x),f(u,x)) = x.
f(f(f(y,f(z,x)),x),f(x,f(u,z))) = x.
f(f(f(y,f(z,x)),x),f(x,f(z,u))) = x.
f(f(f(y,z),x),f(x,f(f(x,z),u))) = x.
f(f(f(y,z),x),f(x,f(u,f(x,z)))) = x.
f(f(f(y,f(z,x)),x),f(f(u,z),x)) = x.
f(f(f(y,z),x),f(x,f(u,f(z,x)))) = x.
f(f(f(y,z),x),f(x,f(f(z,x),u))) = x.
f(f(f(y,f(z,x)),x),f(f(z,u),x)) = x.
f(f(f(y,z),x),f(f(f(x,z),u),x)) = x.
f(f(f(f(f(y,z),x),u),x),f(x,z)) = x.
f(f(f(f(f(y,z),x),u),x),f(z,x)) = x.
f(f(f(y,z),x),f(f(u,f(x,z)),x)) = x.
f(f(f(y,z),x),f(f(u,f(z,x)),x)) = x.
f(f(f(y,z),x),f(f(f(z,x),u),x)) = x.
f(f(f(y,f(f(z,u),x)),x),f(x,z)) = x.
f(f(f(y,f(f(z,u),x)),x),f(z,x)) = x.
f(f(y,x),f(x,f(f(x,f(z,y)),u))) = x.
f(f(y,x),f(x,f(f(x,f(y,z)),u))) = x.
f(f(y,x),f(x,f(z,f(x,f(u,y))))) = x.
f(f(y,x),f(x,f(z,f(x,f(y,u))))) = x.
f(f(y,x),f(x,f(z,f(f(u,y),x)))) = x.
f(f(y,x),f(x,f(f(f(z,y),x),u))) = x.
f(f(y,x),f(x,f(z,f(f(y,u),x)))) = x.
f(f(y,x),f(f(f(x,f(z,y)),u),x)) = x.
f(f(y,x),f(x,f(f(f(y,z),x),u))) = x.
f(f(y,x),f(f(f(x,f(y,z)),u),x)) = x.
f(f(f(f(y,x),z),x),f(x,f(u,y))) = x.
f(f(f(f(y,x),z),x),f(x,f(y,u))) = x.
f(f(y,x),f(f(z,f(x,f(u,y))),x)) = x.
f(f(f(f(y,x),z),x),f(f(u,y),x)) = x.
f(f(y,x),f(f(z,f(x,f(y,u))),x)) = x.
f(f(f(f(y,x),z),x),f(f(y,u),x)) = x.
f(f(y,x),f(f(z,f(f(u,y),x)),x)) = x.
f(f(y,x),f(f(f(f(z,y),x),u),x)) = x.
f(f(y,x),f(f(z,f(f(y,u),x)),x)) = x.
f(f(y,x),f(f(f(f(y,z),x),u),x)) = x.
f(f(f(y,z),x),f(x,f(f(x,y),u))) = x.
f(f(f(y,z),x),f(x,f(u,f(x,y)))) = x.
f(f(f(y,z),x),f(x,f(u,f(y,x)))) = x.
f(f(f(y,z),x),f(x,f(f(y,x),u))) = x.
f(f(f(y,z),x),f(f(f(x,y),u),x)) = x.
f(f(f(f(f(y,z),x),u),x),f(x,y)) = x.
f(f(f(f(f(y,z),x),u),x),f(y,x)) = x.
f(f(f(y,z),x),f(f(u,f(x,y)),x)) = x.
f(f(f(y,z),x),f(f(u,f(y,x)),x)) = x.
f(f(f(y,z),x),f(f(f(y,x),u),x)) = x.
f(f(x,x),f(f(f(x,y),f(x,z)),u)) = x.
f(f(x,x),f(f(f(x,y),f(z,x)),u)) = x.
f(f(x,x),f(f(f(y,x),f(x,z)),u)) = x.
f(f(x,x),f(y,f(f(x,z),f(x,u)))) = x.
f(f(x,x),f(f(f(y,x),f(z,x)),u)) = x.
f(f(x,x),f(y,f(f(x,z),f(u,x)))) = x.
f(f(x,x),f(y,f(f(z,x),f(x,u)))) = x.
f(f(x,x),f(y,f(f(z,x),f(u,x)))) = x.
f(f(f(f(x,y),f(x,z)),u),f(x,x)) = x.
f(f(f(f(x,y),f(z,x)),u),f(x,x)) = x.
f(f(f(f(y,x),f(x,z)),u),f(x,x)) = x.
f(f(y,f(f(x,z),f(x,u))),f(x,x)) = x.
f(f(f(f(y,x),f(z,x)),u),f(x,x)) = x.
f(f(y,f(f(x,z),f(u,x))),f(x,x)) = x.
f(f(y,f(f(z,x),f(x,u))),f(x,x)) = x.
f(f(y,f(f(z,x),f(u,x))),f(x,x)) = x.