(VAR x y z)
(RULES
  not(T) -> F
  not(F) -> T
  or(x,T) -> T
  or(x,F) -> x
  or(x,y) -> or(y,x)
  or(or(x,y),z) -> or(x,or(y,z))
  and(x,T) -> x
  and(x,F) -> F
  and(x,y) -> and(y,x)
  and(and(x,y),z) -> and(x,and(y,z))
  imply(x,y) -> or(not(x),y)
)
(COMMENT from the collection of \cite{AT2012})