* The Deque interface inherits from the {@link Queue} interface. Thus, to use
* a deque as a queue, you can equivalently use the folowing method set:
*
- * ||<)(> ++Queue method++ ||<)(> ++Deque method++ ||
+ * ||<)(> "Queue method" ||<)(> "Deque method" ||
* || {@link Queue.offer} || {@link offer_tail} ||
* || {@link Queue.peek} || {@link peek_head} ||
* || {@link Queue.poll} || {@link poll_head} ||
* To use a deque as a stack, just use the method set that acts at the head of
* the deque:
*
- * ||<)(> ++Operation++ ||<)(> ++Deque method++ ||
+ * ||<)(> "Operation" ||<)(> "Deque method" ||
* || push an element || {@link offer_head} ||
* || peek an element || {@link peek_head} ||
* || pop an element || {@link poll_head} ||