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+// 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;
+}
+
+
+