code: public int removeKey(String inputKey) {
          String key = Normalizer.normalize(inputKey, Normalizer.NORMALIZE_LOWER);
          int num_removed = 0;
          List<String> vals = this.values.remove(key);
          if (null != vals) {
              num_removed = vals.size();
          }
          this.num_items -= num_removed;
          if (TraceComponent.isAnyTracingEnabled() && tc.isDebugEnabled()) {
              Tr.debug(tc, "removeKey: key=" + key + " " + num_removed);
          }
          return num_removed;
      }
docs: Remove an entire key from storage, regardless of how many values it may
  contain.
  
  @param inputKey
  @return int (number of items removed by this action)