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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 get_aggregate_for_symbol(self, symbol: str) -> SecurityAggregate: """ Returns the aggregate for the security found by full symbol """

        security = self.get_by_symbol(symbol)
        if not security:
            raise ValueError(f"Security not found in GC book: {symbol}!")
        return self.get_aggregate(security)