static Map<S, PosNegScore> dm_ontology_trainingSet_firstWordScores() {
  PairL<virtual Is> data = dm_ontology_trainingSet();
  Pair<LS> textData = pair(collect a(data.a), collect a(data.b));
  LS posWords = map firstWord(textData.a);
  LS negWords = map firstWord(textData.b);
  ret countPosNegAsCIMap(posWords, negWords);
}