Heinz Ngolo/School/Conditions/Exercise
The following facts hold: If we are not in vacation and unless it is weekend and if he is not ill, then Heinz Ngolo has to go to school. Today, Heinz Ngolo need not go to school. What can you deduce from this?
The following facts hold: If we are not in vacation and unless it is weekend and if he is not ill, then Heinz Ngolo has to go to school. Today, Heinz Ngolo need not go to school. What can you deduce from this?