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type ref;
// 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;
}
}
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