ometa L <: Parser {
  noun = "apple" | "ball" | "brick",
  pronoun = "he" | "she",
  subject = noun | pronoun,
  verb = "throw",
  adverb = "to" | "in",
  object = noun,

  complex = subject verb object adverb object -> "complex",
  simple = subject verb object -> "simple",
  sentence = complex | simple
}

L.matchAll('he throw brick', 'sentence')