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问题牧羊人赶着一群羊通过36个关口,每过一个关口,守关人将拿走当时羊的一半然后退一只,过完这些关口后牧羊人还剩2只羊,
The Shepherd rushed through a group of sheep through 36 barriers. At each pass, the gatekeepers took half of the sheep and then withdrew one. After the crossings, the shepherds left 2 sheep.