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BNF and EBNF Side by Side

• BNF:

      <expr> -> <expr> + <term>
              | <expr> - <term>
              | <term>
      <term> -> <term> * <factor>
              | <term> / <factor>
              | <factor>
  

• EBNF:

      <expr> -> <term>   {(+ | -) <term>}
      <term> -> <factor> {(* | /) <factor>