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+// types
+type Wicket;
+
+// consts
+const w: Wicket;
+const myBool: bool;
+const v: Wicket;
+const u: Wicket;
+const x: Wicket;
+
+
+// vars
+var favorite: Wicket;
+
+// functions
+function age(Wicket) returns (int);
+
+// axioms
+axiom age(w)==6;
+axiom age(u)==5;
+axiom age(x)==4;
+
+
+// procedure
+procedure SetToSeven(p: Wicket);
+ modifies favorite ;
+
+ ensures favorite==p;
+
+implementation SetToSeven(l: Wicket) {
+ if (age(w)==7) {
+ favorite:=l;
+ } else {
+ favorite:=v;
+ }
+
+}
+
+
+