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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 is_by_step(raw):
 """If the password is alphabet step by step."""

    # make sure it is unicode
    delta = ord(raw[1]) - ord(raw[0])

    for i in range(2, len(raw)):
        if ord(raw[i]) - ord(raw[i-1]) != delta:
            return False

    return True