Fill in the blanks:

A linked list is a list of items called ____ (elements, nodes, items)

A _______ linked list can be traversed in either direction (singly-linked list, Circular linked list, doubly-linked list)

Item insertion in a vector container is accomplished by using the operations _______ and ______ ( pop_back, insert, push_back)

The three main components of STL are ____, _______, and ________. (algorithm, vector, iterator, deque, container)

In a doubly linked list, item insertion and deletion requires the adjustment of ________ pointer(s) in a node (zero, pointer, two)