Think of a very common word (Cat, Dog, Bread, Monkey, Potato, Hair, House, Toothbrush, Money, Glasses, A Book, A Car...), and we'll play 20 Questions. You can answer with "Yes, No, Sometimes, Irrelevant, Unknown, Probably or Doubtful"
For example: Q1. Is it classified as Animal, Vegetable, Mineral, Other or Unknown?
Animal
Q2. Does it have short fur?
Yes.
Q3. Is it gray?
Sometimes.
Q4. Can it growl?
Probably.
....
......
........
Q20. Is it a cat?
Yes!