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The program

(VAR x y z)
(RULES
+(x,0) -> x
+(minus(x),x) -> 0
minus(0) -> 0
minus(minus(x)) -> x
minus(+(x,y)) -> +(minus(y),minus(x))
*(x,1) -> x
*(x,0) -> 0
*(x,+(y,z)) -> +(*(x,y),*(x,z))
*(x,minus(y)) -> minus(*(x,y))
)
(COMMENT Example 4.3 in \cite{SK90})

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