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Correctly format the stacks and lists exercices
author Louis Opter <kalessin@kalessin.fr>
date Mon, 01 Jul 2013 23:25:58 -0700
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FIFO From Two LIFOs
===================

Build a queue (i.e: a list where you queue new elements at the head and dequeue
elements at the tail) from two stacks (i.e: a list where you push and pop at
the head).