// RESULT: 2/3
	Pmin=? [ F "a" ];
	// RESULT: 14/15
	Pmin=? [ F "a" {s=1} ];
	// RESULT: 1
	Pmax=? [ F "a" ];
	// RESULT: 1
	Pmax=? [ F "a" {s=1} ];
	// RESULT: true
	filter(forall, P>0.5 [ F "a" ] <=> (s=0|s=1|s=2));
	// RESULT: true
	filter(forall, P<0.1 [ F "a" ] <=> false);
	// RESULT: true
	filter(forall, P>0 [ F "a" ] <=> (s=0|s=1|s=2));