That's the only drawback to the game, it is little challenging. The terms are in the most difficult category mostly simple (which is why we have moved to a variant in which the coincidence decides whether you get 3, 4 or 5 points. The stack is easily mixed). I think it is so far no one failed, something verbally to explain because of the difficulty by more than three times would have to be tightened.
This naturally resulted that the 5 cards (most severe category) are known. Once this occurs, the game loses unfortunately to voltage. A fun it is anyway!