code: public Map<String, String> getRightIdentityIds() {
          String s = props.getProperty("rightIdentityIds");
          if(s == null) return Collections.emptyMap();
          
          Map<String, String> res = new HashMap<String, String>();
          String[] parts = s.split("[,]");
          res.put(parts[0], parts[1]);
          return res;
      }
docs: Returns the right identity axioms that cannot be represented in RF1 or
  RF2 formats. An example is direct-substance o has-active-ingredient [
  direct-substance. The key of the returned map is the first element in the
  LHS and the value is the second element in the LHS. The RHS, because it
  is a right identity axiom, is always the same as the first element in the
  LHS.
  
  @return The right identity axioms.