Question 9
A beaver has two carrots and wants one pine tree and one bundle of grass. Each castle room offers the following exchanges, from the first item to the second. A: carrot→fish or coin→grass. B: fish→rice or ring→ice cream. C: ice cream→coin or ring→grass. D: carrot→rice or carrot→ice cream. E: carrot→coin or ring→pine tree. F: ring→coin or ice cream→fish. G: ice cream→ring or carrot→grass. H: carrot→grass or rice→fish. What is the minimum number of rooms to enter to obtain both required items?