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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 reverse_search_history(self, e):  # (C-r)
        u'''Search backward starting at the current line and moving up
        through the history as necessary. This is an incremental search.'''
        log("rev_search_history")
        self._init_incremental_search(self._history.reverse_search_history, e)
        self.finalize()