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  1. or download this
    expr      :     term expr_tail
expr_tail : '+' term expr_tail |
  2. or download this
    expr      :     term expr_tail
expr_tail : '+' term expr_tail
          |
  3. or download this
    expr      :     term expr_tail
expr_tail : '+' term expr_tail
          | # Nothing
  4. or download this
    expr      :     term expr_tail
expr_tail : '+' term expr_tail
          | Epsilon

Epsilon   :