1. S sold to B a car for P1M. The condition for the sale is for B to execute a chattel mortgage on the thing sold. The balance of 800,000 is payable in twenty equal installments. B defaulted on the succeeding installments. S sued B for the collection of the balance and the court rendered judgment in favor of S. S by execution of judgment sold the car for P700,000. Can S recover the deficiency? Give reason/s?

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