Convert the BNF grammar in Q.6 to EBNF. Compute the weakest precondition for the following assignment statement and its postcondition x = 3 * (y-5) +2 {x > 8} Convert the BNF grammar in Q.6 to EBNF. Compute the weakest precondition for the following assignment statement and its postcondition x = 3 * (y-5) +2 {x > 8}