(VAR x y z)
(RULES
  +(0,x) -> x
  +(1,-(1)) -> 0
  +(+(x,y),z) -> +(x,+(y,z))
  +(x,y) -> +(y,x)
)
(COMMENT
full experiments for [35]
submitted by: Takahito Aoto and Yoshihito Toyama
)