static <A extends Concept> L<A> findConceptsWhereCI(Class<A> c, O... params) {
  ret findConceptsWhereCI(db_mainConcepts(), c, params);
}

static L<Concept> findConceptsWhereCI(S c, O... params) {
  ret findConceptsWhereCI(db_mainConcepts(), c, params);
}

static <A extends Concept> L<A> findConceptsWhere(Concepts concepts, Class<A> c, O... params) {
  params = expandParams(c, params);
  
  // indexed
  if (concepts.ciFieldIndices != null)
    for (int i = 0; i < l(params); i += 2) {
      IFieldIndex<A, O> index = concepts.getCIFieldIndex(c, (S) params[i]);
      if (index != null) {
        L<A> rawList = index.getAll(params[i+1]);
        params = dropEntryFromParams(params, i);
        if (params == null) ret rawList;
        new L<A> l;
        for (A x : rawList)
          if (checkConceptFieldsCI(x, params)) l.add(x);
        ret l;
      }
    }
    
  // table scan
  ret filterConceptsIC(concepts.list(c), params);
}

static L<Concept> findConceptsWhereCI(Concepts concepts, S c, O... params) {
  ret filterConceptsIC(concepts.list(c), params);
}