(VAR x1 )
(RULES 
        0(1(2(3(4(x1))))) -> 0(2(3(1(4(x1)))))
        0(5(1(2(3(4(x1)))))) -> 0(1(2(5(3(4(x1))))))
        0(5(1(2(3(4(x1)))))) -> 0(5(2(1(3(4(x1))))))
        0(5(1(2(3(4(x1)))))) -> 5(0(2(3(1(4(x1))))))
        0(5(2(3(1(4(x1)))))) -> 0(1(5(2(3(4(x1))))))
        
)