code: public boolean isDeleted(Cell cell)
      {
          int idx = searchInternal(cell.name(), 0);
          // No matter what the counter cell's timestamp is, a tombstone always takes precedence. See CASSANDRA-7346.
          return idx >= 0 && (cell instanceof CounterCell || markedAts[idx] >= cell.timestamp());
      }
docs: Returns whether the given name/timestamp pair is deleted by one of the tombstone
  of this RangeTombstoneList.