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