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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 start_srt():
 """Prepare filenames and patterns then process srt subtitles."""


    extensions = ['srt']
    Config.filenames = prep_files(Config.args, extensions)

    Config.patterns = pattern_logic_srt()

    for filename in Config.filenames:
        SrtProject(filename)