Start
  e_0
    e_3
      '0'@(1:1-1:2)
    '+'@(1:2-1:3)
    e_1
      e_3
        '0'@(1:3-1:4)
      '-'@(1:4-1:5)
      e_2
        e_3
          '0'@(1:5-1:6)
        '*'@(1:6-1:7)
        e_3
          '0'@(1:7-1:8)
  Eof@(1:8-1:8)=''