/home/nowonder/forschung/aprove/TPDB05/TRS/SK90/4.01.trs

The program

(VAR x y z)
(RULES
minus(minus(x)) -> x
minux(+(x,y)) -> +(minus(y),minus(x))
+(minus(x),+(x,y)) -> y
+(+(x,y),minus(y)) -> x
)
(COMMENT Example 4.1 in \cite{SK90})

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