RegexItem * RegexItems::createItem(int start, int end, int depth) {
// TODO Theres still some improvements to be made. Here or in RAdd minimizing
	assert(rItemMatrix[depth][start-1][end-1] == NULL);

	if (rItemMatrix[depth][start-1][end-1]) {
		return rItemMatrix[depth][start-1][end-1];
	}

	RegexItem * newItem = new RegexItem();

	rItemMatrix[depth][start-1][end-1] = newItem;

	if (depth == 0) return newItem;

// variables in the equation
// Not optimal since not all will be required, but good enough.
	RegexItem * Rij = getItem(start, end, depth - 1);
	RegexItem * Rik = getItem(start, depth, depth - 1);
	RegexItem * Rkk = getItem(depth, depth, depth - 1);
	RegexItem * Rkj = getItem(depth, end, depth - 1);

	if (Rij->head) {
		if (!Rik->head || !Rkk->head || !Rkj->head) {
			newItem->head = Rij->head;
			return newItem;
		}

		if (RNode::compareNodes(Rij->head, Rik->head) && RNode::compareNodes(Rkk->head, Rkj->head)) {
			RCon * conNode = new RCon();
			RStar * starNode = new RStar(Rkk->head);

			rNodeList.push_back(conNode);
			rNodeList.push_back(starNode);

			conNode->children.push_back(Rij->head);
			conNode->children.push_back(starNode);

			newItem->head = conNode;

			return newItem;
		}

		if (RNode::compareNodes(Rij->head, Rkj->head) && RNode::compareNodes(Rik->head, Rkk->head)) {
			RCon * conNode = new RCon();
			RStar * starNode = new RStar(Rkk->head);

			rNodeList.push_back(conNode);
			rNodeList.push_back(starNode);

			conNode->children.push_back(starNode);
			conNode->children.push_back(Rij->head);

			newItem->head = conNode;

			return newItem;
		}

		RAdd * addNode = new RAdd();
		RCon * conNode = new RCon();
		RStar * starNode = new RStar(Rkk->head);

		rNodeList.push_back(addNode);
		rNodeList.push_back(conNode);
		rNodeList.push_back(starNode);

		conNode->children.push_back(Rik->head);
		conNode->children.push_back(starNode);
		conNode->children.push_back(Rkj->head);

		addNode->children.push_back(conNode);
		addNode->children.push_back(Rij->head);

		newItem->head = addNode;

		return newItem;

	} else {
		if (!Rik->head || !Rkk->head || !Rkj->head) {
			return newItem;
		}

		RCon * conNode = new RCon;
		RStar * starNode = new RStar(Rkk->head);

		rNodeList.push_back(conNode);
		rNodeList.push_back(starNode);

		conNode->children.push_back(Rik->head);
		conNode->children.push_back(starNode);
		conNode->children.push_back(Rkj->head);

		newItem->head = conNode;
	}

	return newItem;
}