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Given the following BNF, add the ++ and - - operators.

Given the following BNF, add the ++ and - - operators. They should have higher precedence than *
<assign> -> <id> = <expr>
<id> -> A | B | C
<expr> -> <expr> + <term> | <term>
<term> -> <term> * <factor> | <factor>
<factor> -> ( <expr> ) | <id>

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