By the next slice down we'll be able to eliminate what is it about 20 and above, so 30 down to above 20, and this will be an 'in shoes, in shoes, in shoes'.

再往下我们可以继续剔除,是多少来着,20以上的数,在20到30之间的,而这会是一个三次换位思考的过程

耶鲁公开课 - 博弈论课程节选