static L<TripleWeb> ai_thoughtSpace_queryTriples(Symbol a, Symbol b, Symbol c, AbstractThoughtSpace ts) {
  L<TripleWeb> l = null;
  if (!isDollarVar(a)) {
    if (!isDollarVar(b)) ret ts.getOneTwo(a, b);
    l = shortestListUnlessNull2(l, ts.getTriples(a, 0));
    if (l(l) <= 1) ret l;
  }
  if (!isDollarVar(b)) {
    l = shortestListUnlessNull2(l, ts.getTriples(b, 1));
    if (l(l) <= 1) ret l;
  }
  if (!isDollarVar(c)) l = shortestListUnlessNull2(l, ts.getTriples(c, 2));
  ret l;
}