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Text File  |  1992-03-27  |  129b  |  5 lines
  1. <expr>::=<term>|<term>|<term>|<term>+<expr>
  2. <term>::=<elem>|<elem>|<elem>*<term>
  3. <elem>::=<'xyz'>|<'0123'>|(<expr>)
  4. <expr>30
  5.