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(*
Copyright (c) 2013, Richard Emile Sarkis <[email protected]>
All rights reserved.

Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions are met: 

1. Redistributions of source code must retain the above copyright notice, this
   list of conditions and the following disclaimer. 
2. Redistributions in binary form must reproduce the above copyright notice,

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def elapsed_time(start, end):
    """
    >>> from datetime import datetime
    >>> elapsed_time(datetime(2000, 1, 1), datetime(2000, 1, 1, 20, 15))
    '20 hours, and 15 minutes'
    >>> elapsed_time(datetime(2000, 1, 1), datetime(2000, 1, 1, 0, 1))
    '1 minute'
    >>> elapsed_time(datetime(2000, 1, 1), datetime(2000, 1, 2, 0, 1))
    '1 day, and 1 minute'
    >>> elapsed_time(datetime(2000, 1, 1), datetime(2000, 1, 2, 2, 3, 4))