It is from this practice that one laver of kelp, leaving two plates, having two drinks, pouring drinks using the left hand in the opposite way, leaving cups face down etc are avoided.
ここから、コンブ1きれ、杯2つ置くこと、2献のむこと、左酌で逆に酒をいれること、杯をうつぶせて置くことなどを忌みきらう。