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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:
 def _mergeKerningDictionaries(kerningDictionaries):
 """ Merge all of the kerning dictionaries found into one flat dictionary. """

    # work through the dictionaries backwards since
    # this uses an update to load the kerning. this
    # will ensure that the script order is honored.
    kerning = {}
    for dictionaryGroup in reversed(kerningDictionaries):
        for dictionary in dictionaryGroup:
            kerning.update(dictionary)
    # done.
    return kerning