generators.ET0LTreeGrammar("DT0L tree grammar"):
( { line },
  { line:0, start:3, div:3, divb:3, divc:3, divd:3, c1:1, c2:1, c3:1 },
  {
   { line -> div[line,line,line] },
   { line -> divb[line,line,line] },
   { line -> divc[line,line,line] },
   { line -> divd[line,line,line] }
  },
  start[c1[line],c2[line],c3[line]]
)
