Five bears – Jinan, Knot, Lee, Mushu, and Nee-Hau – are kept in three adjacent rooms numbered 1-3 from left to right.
• There is at least one bear in each room.
• The knot is in a room to the left of Lee's.
• Mushu and Nee-Hau are not kept in the same room.
• Either Mushu or Jinan, but not both, are kept in room 2.
• Nee-Hau is kept in room 3.
A sixth bear, Osami, is brought into either room 2 or 3. If there are now two bears in each room, which one of the following must be true?