use    a cat      Does it have whiskers?
use    a goldfish Does it have scales?
use    a snerg    Does it have a tail?
use    a bat      Does it have wings?
use    a cat      Does it have whiskers?
refuse a cat      yes_is "whiskers" is neither animal

5 of 6 got through the program's checks.
what stopped the rest:
  1  yes_is "whiskers" is neither animal

And every one that got through is still a question a
person has to look at, which is check six.
