code: public boolean remove(String inputKey, String inputValue) {
          String key = Normalizer.normalize(inputKey, Normalizer.NORMALIZE_LOWER);
          String value = Normalizer.normalize(inputValue, Normalizer.NORMALIZE_LOWER);
          boolean rc = remove(this.values.get(key), value);
          if (TraceComponent.isAnyTracingEnabled() && tc.isDebugEnabled()) {
              Tr.debug(tc, "remove: " + key + "=" + value + " rc=" + rc);
          }
          return rc;
      }
docs: Remove this specific key=value pair from storage. If this key exists with
  other values, then those will not be touched, only the target value.
  
  @param inputKey
  @param inputValue
  @return boolean (true means success removing)