public void testCoherence() {
		LinkedElement<E> elemf = first;
		LinkedElement<E> elemb = last;
		for (int i = 1; i < total; i++) {
			System.out.println(elemf + "\t|  " + elemb);
			elemf = elemf.getNext();
			elemb = elemb.getPrev();

		}
		System.out.println(elemf + "\t| " + elemb);
		System.out.println("LL Coherence:\tforward: " + (elemf == last) + "\tbackward: " + (elemb == first));

	}