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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 short_full_symbol(self):
 """Gets the full symbol excluding the character under the cursor."""

        if self._short_full_symbol is None:
            self._short_full_symbol = self._symbol_extract(cache.RE_FULL_CURSOR,
                                                           False, True)

        return self._short_full_symbol