public Object get_swizzler(final int vn) {
		final Iterator iter = IndStore.values().iterator();

		while (iter.hasNext()) {
			final Swizzler swz = (Swizzler) iter.next();
			if ((swz.target().valueNumber() == vn)
					|| (swz.ind_var().valueNumber() == vn)) {
				return swz;
			}
		}
		return null;
	}