code: public SampleSetEQOracle<I, D> add(Word<I> input, D expectedOutput) {
          testQueries.add(new DefaultQuery<>(input, expectedOutput));
          return this;
      }
docs: Adds a query word along with its expected output to the sample set.
  
  @param input
  the input word
  @param expectedOutput
  the expected output for this word
  
  @return {@code this}, to enable chained {@code add} or {@code addAll} calls