code: private void resetUnplacedRings() {
          IRing ring = null;
          if (sssr == null) {
              return;
          }
          int unplacedCounter = 0;
          for (int f = 0; f < sssr.getAtomContainerCount(); f++) {
              ring = (IRing) sssr.getAtomContainer(f);
              if (!ring.getFlag(CDKConstants.ISPLACED)) {
                  logger.debug("Ring with " + ring.getAtomCount() + " atoms is not placed.");
                  unplacedCounter++;
                  for (int g = 0; g < ring.getAtomCount(); g++) {
                      ring.getAtom(g).setFlag(CDKConstants.ISPLACED, false);
                  }
              }
          }
          logger.debug("There are " + unplacedCounter + " unplaced Rings.");
      }
docs: Set all the atoms in unplaced rings to be unplaced