There is bean in a bag, have soya bean and gram, a person pours bean on the ground, very fast he parted soya bean and gram, how is he divided excuse me?

• 一个袋子里装着豆子，有黄豆和绿豆，一个人把豆子倒在地上，很快他就把黄豆和绿豆分开了，请问他是怎么分的？