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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 camelize(word):
 """Convert a word from lower_with_underscores to CamelCase. Args: word: The string to convert. Returns: The modified string. """

    return ''.join(w[0].upper() + w[1:]
                   for w in re.sub('[^A-Z^a-z^0-9^:]+', ' ', word).split(' '))