MAYBE

Problem:
 0(1(2(0(3(4(x1)))))) -> 0(1(0(2(3(4(x1))))))
 1(2(3(1(4(4(1(x1))))))) -> 1(2(1(3(4(4(1(x1)))))))
 2(2(5(3(2(4(5(3(x1)))))))) -> 2(2(5(2(3(4(5(3(x1))))))))
 4(2(3(5(4(2(2(0(x1)))))))) -> 4(2(5(3(4(2(2(0(x1))))))))
 5(3(5(1(5(3(5(3(x1)))))))) -> 5(3(5(1(3(5(5(3(x1))))))))
 3(2(3(1(3(5(4(1(1(x1))))))))) -> 3(1(3(3(4(2(1(5(1(x1)))))))))
 3(4(2(5(3(2(1(2(1(x1))))))))) -> 3(4(2(5(3(1(2(2(1(x1)))))))))
 3(1(3(0(4(5(2(4(5(0(x1)))))))))) -> 3(1(3(4(0(5(2(4(5(0(x1))))))))))
 4(5(5(1(2(1(3(2(3(2(x1)))))))))) -> 5(5(0(0(5(0(3(3(2(1(x1))))))))))
 5(0(1(4(1(2(5(1(5(2(x1)))))))))) -> 4(5(5(0(2(0(5(4(5(4(x1))))))))))
 5(0(5(4(0(3(1(5(4(2(x1)))))))))) -> 5(0(5(4(0(1(3(5(4(2(x1))))))))))
 0(3(0(2(4(1(2(2(4(0(5(x1))))))))))) -> 2(4(4(3(0(2(5(1(4(4(x1))))))))))
 0(5(0(3(0(1(2(4(0(4(3(x1))))))))))) -> 5(0(4(5(1(0(1(4(2(3(x1))))))))))
 0(5(2(4(1(5(0(2(1(5(1(x1))))))))))) -> 5(0(1(1(1(4(2(0(3(0(x1))))))))))
 0(5(3(5(0(5(3(3(2(1(3(x1))))))))))) -> 0(3(4(0(5(1(4(4(5(2(x1))))))))))
 0(5(4(4(1(0(5(1(4(5(5(x1))))))))))) -> 0(1(3(4(4(1(4(3(5(0(x1))))))))))
 1(3(2(2(5(5(1(5(1(2(1(x1))))))))))) -> 4(4(0(0(1(2(4(1(5(4(x1))))))))))
 1(4(4(5(2(2(1(0(0(0(2(x1))))))))))) -> 3(5(1(1(4(2(4(0(2(0(x1))))))))))
 1(5(0(4(0(1(2(5(5(5(3(x1))))))))))) -> 4(3(2(3(2(4(1(0(3(3(x1))))))))))
 1(5(1(2(2(1(1(0(5(5(0(x1))))))))))) -> 0(3(0(1(1(2(2(0(1(4(x1))))))))))
 2(0(0(4(5(0(5(3(0(4(2(x1))))))))))) -> 2(0(0(4(5(5(0(3(4(0(2(x1)))))))))))
 2(1(5(3(3(1(4(1(0(4(0(x1))))))))))) -> 4(4(3(5(0(0(5(3(2(4(x1))))))))))
 2(2(4(1(3(2(4(0(2(5(4(x1))))))))))) -> 0(4(2(3(1(2(3(0(1(4(x1))))))))))
 2(3(2(4(0(0(3(4(3(2(0(x1))))))))))) -> 5(2(1(5(0(5(1(1(5(3(x1))))))))))
 2(3(4(1(2(3(2(2(0(5(0(x1))))))))))) -> 2(2(3(0(5(1(4(1(1(2(x1))))))))))
 2(5(0(1(0(5(3(1(2(1(0(x1))))))))))) -> 4(1(3(0(5(0(0(0(2(3(x1))))))))))
 3(0(0(4(5(2(5(3(5(4(1(x1))))))))))) -> 3(4(2(2(3(3(3(4(5(0(x1))))))))))
 3(0(3(5(4(0(4(3(5(2(5(x1))))))))))) -> 2(4(0(3(4(1(2(0(1(5(x1))))))))))
 3(1(4(0(5(0(4(1(1(0(5(x1))))))))))) -> 0(4(4(5(0(0(0(3(1(0(x1))))))))))
 3(2(0(3(0(3(1(3(5(5(5(x1))))))))))) -> 0(3(2(4(1(5(1(0(5(1(x1))))))))))
 3(2(2(2(0(5(1(2(3(5(0(x1))))))))))) -> 3(2(2(2(5(0(1(2(3(5(0(x1)))))))))))
 3(2(3(0(0(0(2(4(2(1(1(x1))))))))))) -> 2(4(0(0(4(3(0(2(5(3(x1))))))))))
 3(5(0(5(4(0(0(4(4(2(4(x1))))))))))) -> 2(0(3(5(5(0(2(1(4(3(x1))))))))))
 3(5(4(2(3(0(4(0(5(1(2(x1))))))))))) -> 1(3(4(2(3(5(5(1(1(2(x1))))))))))
 4(1(3(0(4(5(4(2(4(2(5(x1))))))))))) -> 0(5(2(1(0(2(3(3(5(3(x1))))))))))
 4(2(2(0(4(0(1(4(5(3(3(x1))))))))))) -> 1(0(0(0(0(5(1(0(5(3(x1))))))))))
 4(3(3(4(3(1(0(2(5(4(1(x1))))))))))) -> 0(5(5(0(5(1(4(2(1(5(x1))))))))))
 4(3(4(1(1(5(5(5(3(4(2(x1))))))))))) -> 4(5(5(0(1(2(3(1(3(5(x1))))))))))
 4(3(4(4(2(4(4(2(0(4(4(x1))))))))))) -> 5(3(1(2(0(4(3(5(3(2(x1))))))))))
 4(4(3(2(1(5(3(4(0(0(4(x1))))))))))) -> 5(0(2(4(0(1(4(1(4(4(x1))))))))))
 4(4(5(4(1(4(1(1(5(3(5(x1))))))))))) -> 2(5(5(2(3(2(5(4(3(0(x1))))))))))
 4(5(1(5(4(4(3(5(1(2(1(x1))))))))))) -> 4(3(0(4(3(0(3(3(5(4(x1))))))))))
 5(1(4(3(3(2(0(5(1(4(2(x1))))))))))) -> 4(3(5(1(5(5(5(1(2(2(x1))))))))))
 5(3(4(4(0(0(1(1(5(1(4(x1))))))))))) -> 3(2(4(2(0(0(4(1(3(0(x1))))))))))
 5(3(5(2(3(2(2(1(0(3(5(x1))))))))))) -> 0(3(2(1(0(0(0(0(2(4(x1))))))))))
 5(4(0(1(2(1(1(4(5(2(0(x1))))))))))) -> 5(4(5(4(3(4(1(1(3(1(x1))))))))))
 5(5(2(4(3(5(3(4(0(3(4(x1))))))))))) -> 2(0(0(3(2(4(0(1(3(5(x1))))))))))
 5(5(5(0(0(3(5(4(4(2(1(x1))))))))))) -> 1(0(3(2(1(5(5(1(0(0(x1))))))))))
 0(0(1(0(4(1(4(5(4(3(1(0(x1)))))))))))) -> 0(0(1(0(1(4(4(5(4(3(1(0(x1))))))))))))
 0(1(3(3(5(0(3(1(5(4(3(5(x1)))))))))))) -> 5(3(3(2(1(0(1(1(3(1(x1))))))))))
 1(1(0(5(1(1(3(1(4(2(4(0(x1)))))))))))) -> 4(5(1(5(2(1(3(2(0(4(x1))))))))))
 1(2(4(1(4(4(2(1(5(4(0(0(x1)))))))))))) -> 1(1(3(4(5(1(2(4(3(2(x1))))))))))
 1(3(0(0(4(5(3(4(3(0(0(1(x1)))))))))))) -> 3(5(4(5(0(3(4(4(2(5(x1))))))))))
 2(2(3(4(2(0(5(4(3(0(0(0(x1)))))))))))) -> 0(1(2(2(3(2(4(0(1(3(x1))))))))))
 2(2(4(2(3(0(5(3(0(5(5(3(x1)))))))))))) -> 0(4(4(3(5(4(4(1(5(1(x1))))))))))
 3(0(3(1(5(0(3(1(1(0(2(3(x1)))))))))))) -> 5(1(4(4(5(4(1(1(1(1(x1))))))))))
 3(1(0(4(0(2(5(2(4(3(0(0(x1)))))))))))) -> 2(1(2(2(3(1(0(4(1(4(x1))))))))))
 5(1(3(3(3(4(0(5(3(4(5(5(x1)))))))))))) -> 3(0(1(4(4(5(2(5(5(5(x1))))))))))
 5(3(0(3(5(3(0(1(5(3(4(0(x1)))))))))))) -> 4(3(2(1(0(3(2(4(0(0(x1))))))))))
 5(5(4(4(0(4(4(3(4(4(5(5(x1)))))))))))) -> 5(0(4(4(4(4(1(5(1(4(x1))))))))))
 1(0(2(0(1(1(0(4(5(3(0(3(5(x1))))))))))))) -> 3(0(2(0(1(5(4(4(2(4(x1))))))))))
 3(0(4(0(4(0(4(3(5(0(0(1(3(x1))))))))))))) -> 3(0(4(0(4(0(4(5(3(0(0(1(3(x1)))))))))))))
 4(3(4(1(0(3(5(3(2(2(0(2(3(x1))))))))))))) -> 4(3(4(1(0(3(5(2(3(2(0(2(3(x1)))))))))))))
 4(4(3(4(3(1(4(5(4(2(2(0(5(4(x1)))))))))))))) -> 4(4(3(4(3(1(4(5(2(2(0(4(5(4(x1))))))))))))))
 5(0(0(1(0(3(4(3(5(5(5(3(0(0(x1)))))))))))))) -> 5(2(4(2(1(1(3(1(1(2(x1))))))))))
 2(0(5(1(1(0(0(2(4(0(0(1(4(1(0(x1))))))))))))))) -> 2(0(5(1(1(0(0(2(4(0(1(0(4(1(0(x1)))))))))))))))
 4(0(5(4(2(5(4(0(2(5(2(2(1(3(2(x1))))))))))))))) -> 4(2(4(4(5(5(2(3(5(2(2(0(1(0(2(x1)))))))))))))))
 1(1(4(4(4(2(3(1(4(4(0(5(0(4(4(4(x1)))))))))))))))) ->
 1(1(4(4(4(2(3(1(4(0(4(5(0(4(4(4(x1))))))))))))))))
 5(3(5(0(2(0(1(4(5(0(1(0(4(3(5(4(x1)))))))))))))))) ->
 5(3(0(5(2(0(1(4(5(0(1(0(4(3(5(4(x1))))))))))))))))
 2(5(3(4(0(3(4(5(5(4(5(3(4(4(5(3(4(x1))))))))))))))))) ->
 2(5(3(4(0(3(4(5(5(5(4(3(4(4(5(3(4(x1)))))))))))))))))
 4(3(2(0(5(1(4(1(4(0(0(0(3(1(5(5(5(x1))))))))))))))))) ->
 4(3(2(0(1(5(4(1(4(0(0(0(3(1(5(5(5(x1)))))))))))))))))
 4(5(2(5(4(0(0(5(5(3(2(3(5(0(5(4(4(x1))))))))))))))))) ->
 4(5(5(2(4(0(0(5(5(3(3(2(0(5(4(5(4(x1)))))))))))))))))
 5(5(2(4(2(2(1(4(2(1(4(1(2(2(4(0(4(x1))))))))))))))))) ->
 5(2(2(2(4(4(5(2(1(1(4(0(1(2(2(4(4(x1)))))))))))))))))
 4(4(0(2(5(1(2(1(0(3(4(4(4(5(4(2(0(0(4(x1))))))))))))))))))) ->
 4(4(0(2(5(1(2(1(0(3(4(4(4(5(2(4(0(0(4(x1)))))))))))))))))))
 0(3(4(5(3(2(0(0(4(4(4(5(0(1(3(3(4(3(1(1(x1)))))))))))))))))))) ->
 0(3(4(3(5(2(0(0(4(4(4(5(0(1(3(3(4(3(1(1(x1))))))))))))))))))))
 1(4(0(4(1(5(4(3(4(3(0(5(5(1(1(1(2(2(1(4(x1)))))))))))))))))))) ->
 1(4(4(0(1(4(3(5(4(3(0(5(1(5(1(2(1(2(1(4(x1))))))))))))))))))))
 3(5(1(3(1(4(4(2(3(1(0(4(3(2(0(4(3(2(5(1(x1)))))))))))))))))))) ->
 3(5(1(3(1(4(4(2(3(1(0(4(3(0(2(4(3(2(5(1(x1))))))))))))))))))))
 3(0(3(2(3(2(3(2(4(3(3(0(1(2(4(2(3(5(2(3(3(x1))))))))))))))))))))) ->
 3(0(3(2(3(2(3(4(2(3(3(0(1(2(4(2(3(5(2(3(3(x1)))))))))))))))))))))
 1(3(0(2(0(4(1(2(2(2(5(5(4(3(5(2(4(1(2(3(3(3(x1)))))))))))))))))))))) ->
 1(3(0(2(0(4(1(2(2(2(5(5(3(4(5(2(4(1(2(3(3(3(x1))))))))))))))))))))))
 3(4(2(2(2(3(4(0(3(0(1(1(4(1(3(0(0(0(1(1(5(3(x1)))))))))))))))))))))) ->
 3(4(0(2(2(4(3(2(1(0(4(5(1(3(1(1(0(0(3(1(0(3(x1))))))))))))))))))))))
 4(1(5(4(5(4(5(3(1(3(1(1(1(3(4(1(0(1(3(2(0(3(x1)))))))))))))))))))))) ->
 4(1(5(5(4(4(5(3(1(3(1(1(1(3(4(1(0(1(3(2(0(3(x1))))))))))))))))))))))
 0(5(4(5(3(0(2(1(5(2(0(0(4(5(4(1(0(1(2(0(1(5(0(x1))))))))))))))))))))))) ->
 0(5(4(3(5(2(0(5(5(1(2(4(0(0(0(0(1(1(2(4(1(5(0(x1)))))))))))))))))))))))
 0(3(1(4(5(3(0(4(5(4(2(5(3(4(3(0(5(5(0(2(3(3(0(3(x1)))))))))))))))))))))))) ->
 0(3(1(4(5(3(4(0(5(4(2(5(3(4(3(0(5(5(0(2(3(3(0(3(x1))))))))))))))))))))))))
 1(4(3(0(1(0(2(2(5(5(1(0(1(2(2(5(4(3(2(5(2(2(0(2(0(x1))))))))))))))))))))))))) ->
 1(4(3(0(1(0(2(2(5(5(1(0(1(2(5(2(4(3(2(5(2(2(0(2(0(x1)))))))))))))))))))))))))
 2(3(3(4(0(0(2(0(4(5(4(3(5(4(3(4(3(1(5(3(2(3(5(3(3(x1))))))))))))))))))))))))) ->
 2(3(3(4(0(0(2(4(0(5(4(3(5(4(3(4(3(1(5(3(2(3(5(3(3(x1)))))))))))))))))))))))))
 3(2(0(5(2(1(2(1(1(0(5(0(3(4(2(2(3(0(2(4(3(4(0(0(1(x1))))))))))))))))))))))))) ->
 3(2(0(5(2(1(2(1(1(0(5(0(3(4(2(2(3(0(4(2(3(4(0(0(1(x1)))))))))))))))))))))))))
 3(4(1(5(5(1(1(2(0(5(3(3(0(5(2(5(0(2(0(3(5(5(0(5(3(x1))))))))))))))))))))))))) ->
 3(4(1(5(5(1(1(2(0(5(3(3(0(5(5(2(0(2(0(3(5(5(0(5(3(x1)))))))))))))))))))))))))
 4(5(2(0(0(1(2(1(5(1(2(2(5(0(2(0(2(0(0(2(2(5(3(1(1(x1))))))))))))))))))))))))) ->
 4(5(2(0(0(1(2(1(5(1(2(2(0(5(2(0(2(0(0(2(2(5(3(1(1(x1)))))))))))))))))))))))))
 1(3(2(3(3(1(0(5(5(3(4(0(4(2(4(3(2(5(2(2(1(5(2(4(1(5(x1)))))))))))))))))))))))))) ->
 1(3(3(2(1(0(3(5(5(4(3(4(0(2(4(3(2(5(2(2(5(1(2(4(1(5(x1))))))))))))))))))))))))))
 0(4(4(2(1(1(2(1(1(0(4(3(4(1(1(0(0(3(4(3(5(4(4(2(0(3(5(x1))))))))))))))))))))))))))) ->
 0(4(4(2(1(1(2(1(1(0(4(3(4(1(1(0(0(3(4(3(5(4(4(0(2(3(5(x1)))))))))))))))))))))))))))
 5(2(0(4(2(2(5(5(4(5(5(2(4(3(5(5(3(3(2(5(0(4(3(0(1(2(2(x1))))))))))))))))))))))))))) ->
 5(2(0(4(2(2(5(5(4(5(5(2(4(3(5(5(3(3(2(5(0(3(4(0(1(2(2(x1)))))))))))))))))))))))))))
 5(3(5(4(5(5(4(1(5(5(3(4(1(2(1(1(2(1(0(1(3(0(4(2(5(1(2(x1))))))))))))))))))))))))))) ->
 5(5(5(4(3(5(5(1(4(4(5(3(1(1(1(0(1(2(2(1(0(4(3(5(2(1(2(x1)))))))))))))))))))))))))))
 2(0(1(5(2(1(5(0(5(2(4(2(0(0(5(2(0(1(0(2(2(5(0(3(5(4(2(5(2(x1))))))))))))))))))))))))))))) ->
 2(0(1(5(2(1(5(0(5(2(4(2(0(0(5(2(0(1(0(2(2(5(3(0(5(4(2(5(2(x1)))))))))))))))))))))))))))))
 5(1(4(3(1(0(4(3(5(5(4(3(3(3(3(2(3(5(0(1(5(0(3(3(5(1(2(3(0(x1))))))))))))))))))))))))))))) ->
 5(1(4(3(1(0(4(3(5(5(4(3(3(3(3(2(3(5(0(5(1(0(3(3(5(1(2(3(0(x1)))))))))))))))))))))))))))))
 0(3(1(0(1(5(1(0(2(3(2(3(3(0(1(3(5(2(4(5(2(0(2(4(1(4(4(5(1(4(x1)))))))))))))))))))))))))))))) ->
 0(3(1(0(1(5(1(0(2(3(2(3(3(0(1(3(5(2(4(5(2(0(4(2(1(4(4(5(1(4(x1))))))))))))))))))))))))))))))

Proof:
 Open