(VAR x1 )
(RULES 
        b(a(a(x1))) -> a(b(c(x1)))
        c(a(x1)) -> a(c(x1))
        c(b(x1)) -> b(a(x1))
        L(a(a(x1))) -> L(a(b(c(x1))))
        c(R(x1)) -> b(a(R(x1)))
        
)