What values are returned during the following sequence of deque ADT operations, on initially empty deque? add

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What values are returned during the following sequence of deque ADT operations, on initially empty deque? add first(4), add last(8), add last(9), add first(5), back(), delete first( ), delete last( ), add last(7), first( ), last( ), add last(6), delete first( ), delete first( ).

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Data Structures and Algorithms in Python

ISBN: 978-1118290279

1st edition

Authors: Michael T. Goodrich, Roberto Tamassia, Michael H. Goldwasser

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