arraystack

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Copyright (c) 2015, Emir Pasic
All rights reserved.

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AVL Tree:

Copyright (c) 2017 Benjamin Scher Purcell <benjapurcell@gmail.com>

Permission to use, copy, modify, and distribute this software for any
purpose with or without fee is hereby granted, provided that the above
copyright notice and this permission notice appear in all copies.

THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
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OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.