class LNode{
    T Data
    LNode next
}

class MyLinkList{
    Node head
    addFirst(LNode node)
    addLast(LNode node)
    insertAfter(LNode node)
    insertBefore(LNode node)
    findByIndex(int index)
    deleteFirst()
    deleteLast()
    deleteIndex(int index)
    deleteNode(LNode node)
}