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