Code example for Collection

Methods: isEmptyremove

     * @return true if this was the the last occurence of the signature 
    public boolean remove(Tuple ps, Tuple signature) {
        Collection<Tuple> coll = matchings.get(signature);
        if (!coll.remove(ps)) {
            throw new IllegalStateException();
        boolean change = coll.isEmpty();
        if (change)
        return change;
     * Retrieves entries that have the specified signature 
     * @return collection of matchings found 
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