code: PartialMatch newPartialMatch() {
      if (tc.isEntryEnabled())
        tc.entry(this,cclass, "newPartialMatch");
      PartialMatch ans = new PartialTopicMatch(owner);
      if (tc.isEntryEnabled())
        tc.exit(this,cclass, "newPartialMatch", ans);
      return ans;
    }
docs: Implement newPartialMatch