Python code. Instruction are given within the quotations for each function. 1) definvert_dict(d):   """ Given a dictionary d, create the invert of the dictionary where the key is a value v in d, and v is mapped to a set of keys in original d whose values are equal to v. Return the inverted dictionary mapping value to set of keys   """   2) defhistogram(words):   """ Given a list of words, create a histogram dictionary where the key is the length of a word and the value is the count of how many words in the list are of that length. Return the histogram dictionary mapping length to word counts   """

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