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?Set1 subsetof ?Set2

Set1 is a (non-strict) subset of the integer set Set2

Set1: a set, set variable, free variable or set expression
Set2: a set, set variable or set expression

Examples

    	?- X subset [1,2,3].
	X = X{([] .. [1, 2, 3]) : _398{0 .. 3}}

	?- X subsetof [1,2,3], Y subsetof X.
	X = X{([] .. [1, 2, 3]) : _398{0 .. 3}}
	Y = Y{([] .. [1, 2, 3]) : _531{0 .. 3}}

	?- [1,2,3] subsetof Y.
	instantiation fault