About the 3rd and 4th rules, I described them as
However, with this set it was not easy to make further inferences.
On the other hand, the explanation on pg 155 describes the rules without box
With these rules, I can spot contra-positives, and I can finally make inferences with "Cent."
My problem is I do not know when is best to use box or not.
In basic linear games, there were many cases when box was helpful and essential to the game such as game #6 in basic linear.
Is there distinction drawn for the stimuli using box?
Once I used box for this problem, it was very difficult to make inferences necessary for questions.