In an alternate universe where animals generally enjoy being kept in cages, you've been placed in charge of the monkey house. The hardest part of your job, other than avoiding flung excrement, is arranging the monkeys in their cages so that all of them are happy. Here's what you've learned so far:

1. Orangutangs are happy no matter where they are.
2. Chimpanzees are only happy if another chimpanzee is in a cage next to them.
3. Gorillas are only happy if an orangutang is in a cage next to them AND no chimpanzees are next to them.