premise: Exactly six petri dishes—labeled dish 1 through dish 6—are to be stored in an otherwise empty refrigerator. There are three available shelves—the bottom shelf, the middle shelf, and the top shelf. The placement of the dishes must be consistent with the following conditions: No more than three dishes are stored on any shelf. Dish 2 is stored at least one shelf above dish 6. Dish 6 is stored either one shelf above or one shelf below dish 5. Dish 1 is not stored on the same shelf as dish 4. Which one of the following is an acceptable placement of dishes on the bottom, middle, and top shelves?
hypothesis: bottom: dishes 1, 3 middle: dish 6 top: dishes 2, 4, 5