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type ref;
type Wicket;
var favorite: Wicket;
var hate: Wicket;
procedure NewFavorite(p: Wicket);
modifies favorite
;
ensures favorite==p;
implementation NewFavorite(l: Wicket) {
favorite:=l;
}
procedure Swap();
modifies favorite,hate;
ensures favorite==old(hate);
implementation Swap() {
hate := favorite;
}
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