Prepare two groups of sake samples of different brands; assign numbers 1, 2, 3 and on and arrange them according to the numbers for sake samples in one group, while assign alphabets A, B, C and on and arrange them by changing the orders of the letters for those in the other group.
複数の日本酒を用意し、一方に(1)、(2)、(3)…という風に並べ、もう一方に同じ酒をA、B、C…と順番を変えて並べる。