if COMREL is a predicate (function) that holds among (has the value VAL for) a given sequence of arguments, then COMREL also holds among (has the same value VAL for) any permutation of that sequence. Instances include #$PlusFn, #$or, #$bordersOn, #$temporallyIntersects, and #$teammates. Specialization include #$SymmetricBinaryPredicate. Note that most relations are _not_ commutative. See also #$PartiallyCommutativeRelation.<br />
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