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Jason is a programming language to develop BDI/cognitive agents

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package jason.stdlib.set;

import java.util.Collection;

import jason.asSemantics.InternalAction;
import jason.asSemantics.TransitionSystem;
import jason.asSemantics.Unifier;
import jason.asSyntax.Term;


public class difference extends add {

    private static InternalAction singleton = null;
    public static InternalAction create() {
        if (singleton == null)
            singleton = new difference();
        return singleton;
    }

    @Override
    public Object execute(TransitionSystem ts, Unifier un, Term[] args) throws Exception {
        getSet(un,args).difference((Collection)args[1]);
        return true;
    }
}