generators.ET0LTreeGrammar("twindragon outline"):
( { S0, S, A },
  { line2:0, H:2, K:2, I:2 },
  {
    { 
      S0 -> I[S,S],
      S  -> H[S,A],
      A  -> K[S,S]
   },
  { 
      S0 -> line2,
      S  -> H[line2,line2],
      A  -> K[line2,line2]
     }
  },
  S0 )
