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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 unwrap_raw(content):
 """ unwraps the callback and returns the raw content """

    starting_symbol = get_start_symbol(content)
    ending_symbol = ']' if starting_symbol == '[' else '}'
    start = content.find(starting_symbol, 0)
    end = content.rfind(ending_symbol)
    return content[start:end+1]