(VAR x y z )
(RULES 
        *(x, +(y, z)) -> +(*(x, y), *(x, z))
        *(+(y, z), x) -> +(*(x, y), *(x, z))
        *(*(x, y), z) -> *(x, *(y, z))
        +(+(x, y), z) -> +(x, +(y, z))
        
)