svoid ai_combinePosAndNegNGramScorersForLanguageDetectionTask(LanguageDetectionTask task) {
  LS exprs = pairsA((LPairS) dm_callAndImport(dm_languageDetectionNGramScorersCRUD(), 'expressionsForTask, task.task()));
  LS pos = notStartingWith(exprs, "^");
  LS neg = startingWith(exprs, "^");

  Set<S> seen = ciSet();
  new DynamicTopTen<S> tt;
   
  repeat 1000 {
    S expr = firstNotSeen_nAttempts(1000, seen, () -> 
      ai_combineNGramScorers_noDuplicates(random(pos), random(neg))
    );
    if (expr == null) break with print("Can't find any new expressions");
    tt.add(expr, scoreNGramScorer(expr, task.pos, task.neg));
  }
    
  pnl(tt.withScores());
  dm_saveLanguageDetectionNGramScorers(task, tt);
}