// Link l's right to r; r's left to l
private void linkLeftRight(LN<E> l, LN<E> r) {
l.right = r;
r.left = l;
}
// Link l's right to r; r's left to l
private void linkLeftRight(LN<E> l, LN<E> r) {
l.right = r;
r.left = l;
}
