(VAR x y z )
(RULES 
        not(not(x)) -> x
        not(or(x, y)) -> and(not(x), not(y))
        not(and(x, y)) -> or(not(x), not(y))
        and(x, or(y, z)) -> or(and(x, y), and(x, z))
        and(or(y, z), x) -> or(and(x, y), and(x, z))
        
)