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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 close_ns(symbol):
        '''generates a closing names statement from a symbol'''
        closing = ' '.join(['}' for x in symbol.module.name_parts])
        name = '::'.join(symbol.module.name_parts)
        return '{0} // namespace {1}'.format(closing, name)