(VAR x y z)
(RULES
   E(+(x,y)) -> *(E(x),E(y))
   E(0) -> 1
   +(x,0) -> x
   +(0,x) -> x
   *(x,1) -> x
   *(1,x) -> x
   +(+(x,y),z) -> +(x,+(y,z))
   +(x,+(y,z)) -> +(+(x,y),z)
   +(x,y) -> +(y,x)
   *(*(x,y),z) -> *(x,*(y,z))
   *(x,*(y,z)) -> *(*(x,y),z)
   *(x,y) -> *(y,x)
)
(COMMENT
doi:10.1145/322217.322230
[12] p. 819
submitted by: Aart Middeldorp
)