generators.ET0LTreeGrammar:
  ( { S },
    { F:3, G:3, H:3, I:3, J:3, K:3, L:3, S:0 },
    { { S -> G[S,S,S], S -> H[S,S,S], S -> I[S,S,S], S -> J[S,S,S], S -> K[S,S,S], S -> L[S,S,S] } },
    S )
