code: private static <T> IntPair findBridgeIndexes(PSArray<Point2D<T>> earlyHull, PSArray<Point2D<T>> laterHull, int earlyStart, int laterStart, MultipliableNumberSystem<T> ns) {
          int early = earlyStart;
          int later = laterStart;
          while (true) {
              int nextEarly = getPreIndex(early, earlyHull.size());
              int nextLater = getNextIndex(later, laterHull.size());
              if (LeftTurn.is(laterHull.get(later), earlyHull.get(early), earlyHull.get(nextEarly), ns))
                  early = nextEarly;
              else if (RightTurn.is(earlyHull.get(early), laterHull.get(later), laterHull.get(nextLater), ns))
                  later = nextLater;
              else
                  break;
          }
          return new IntPair(early, later);
      }
docs: early, later are ordered by ccw order.