Start
  re_0
    re$0_1
      '('@(1:1-1:2)
      re$1_0
        re$0_0
          'a'@(1:2-1:3)
        re$0_1
          '('@(1:3-1:4)
          re$1_0
            re$0_0
              'a'@(1:4-1:5)
            re$0_0
              'a'@(1:5-1:6)
          ')'@(1:6-1:7)
      ')'@(1:7-1:8)
    '|'@(1:9-1:10)
    re$0_1
      '('@(2:1-2:2)
      re$1_0
        re$0_1
          '('@(2:2-2:3)
          re$1_0
            re$0_0
              'a'@(2:3-2:4)
            re$0_0
              'a'@(2:4-2:5)
          ')'@(2:5-2:6)
        re$0_0
          'a'@(2:6-2:7)
      ')'@(2:7-2:8)
  Eof@(3:1-3:1)=''