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type ref;
// types
type Color;
const unique red: Color;
const unique blue: Color;
const unique green: Color;
axiom (forall ce:Color :: ce==red || ce==blue || ce==green);
var myColor: Color;
// procedure
procedure SetTo(c: Color);
modifies myColor
;
ensures myColor==c;
implementation SetTo(c: Color) {
assert (blue==green);
myColor:=blue;
}
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