code: public ValueNumber[] lookupOutputValues(Entry entry) {
          if (DEBUG) {
              System.out.println("VN cache lookup: " + entry);
          }
          ValueNumber[] result = entryToOutputMap.get(entry);
          if (DEBUG) {
              System.out.println("   result ==> " + Arrays.toString(result));
          }
          return result;
      }
docs: Look up cached output values for given entry.
  
  @param entry
  the entry
  @return the list of output values, or null if there is no matching entry
  in the cache