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type Color;
const Blue, Red, Green : Color;
axiom (forall x : Color :: x == Blue || x == Red || x == Green);
procedure P() returns () {
var x : Color;
assume x != Blue;
assert x == Red; // should not be provable
}
procedure Q() returns () {
var x : Color;
assume x != Blue && x != Green;
assert x == Red;
}
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