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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 combine_word_list(word_list):
 """ Combine word list into a bag-of-words. Input: - word_list: This is a python list of strings. Output: - bag_of_words: This is the corresponding multi-set or bag-of-words, in the form of a python dictionary. """

    bag_of_words = collections.defaultdict(int)

    for word in word_list:
        bag_of_words[word] += 1

    return bag_of_words