Dequeue operation

insert element at back-    q.push_back(element); /push in right
insert element at front-    q.push_front(element); / push in left
remove last element   -                  q.pop_back();  /pop in right
remove first element       -               q.pop_front();  /pop in left
examine last element       -       q.back() / see right/last element
examine first element       -       q.front() / see left/first element

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