private boolean isSubtreeHelper(TreeNode root1, TreeNode root2) {
		if (root1 != null && root2 != null) {
			if (root1.info == root2.info) {
				return (isSubtree(root1.left, root2.left) && isSubtree(
						root1.right, root2.right));
			} else {
				return (isSubtree(root1.left, root2) || isSubtree(root1.right,
						root2));
			}
		}
		return false;
	}