code: private void checkOthers(Collidable objectA, Entry<Point, Set<Collidable>> current)
      {
          for (final Integer acceptedGroup : objectA.getAccepted())
          {
              // Others to compare only in accepted group
              if (collidables.containsKey(acceptedGroup))
              {
                  checkOthers(objectA, current, acceptedGroup);
              }
          }
      }
docs: Check others element.
  
  @param objectA The collidable reference.
  @param current The current group to check.