(VAR x y z )
(RULES 
        a(lambda(x),y) -> lambda(a(x,1))
        a(lambda(x),y) -> lambda(a(x,a(y,t)))
        a(a(x,y),z) -> a(x,a(y,z))
        lambda(x) -> x
        a(x,y) -> x
        a(x,y) -> y
        
)