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Extended BNF (EBNF)

• Optional parts are placed in brackets ([])

      <proc_call> -> ident [ (<expr_list>) ]
  

• Put alternative parts of RHS in parentheses and separate them with vertical bars

      <term> -> <term> (+ | -) const
  

• Put repetitions (0 or more) in braces ({})

      <ident> -> letter {letter | digit}