Start
  p
    Nodes[Nt]
      t_2
        a3@(1:1-1:4)='aaa'
      t_2
        a3@(1:4-1:7)='aaa'
      t_2
        a3@(1:7-1:10)='aaa'
  Eof@(1:10-1:10)=''