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Networks网络
Two exercises on the same 40 students, 20 in Arts and 20 in Engineering. The first records who talked to whom last month. The second starts with one Engineering student saying an elective still has seats, and lets that news pass along those talks.两页练习用同一批 40 名学生，文学院 20 人、工程学院 20 人。第一页记下上个月谁和谁说过话。第二页从工程学院的一名学生说起“选修课还有名额”，再让这句话沿着这些谈话传。
Talks are more common inside a faculty than across. The faculty names are already on the sheet before any line is drawn.学院内部的谈话比跨学院更多。学院的名字在任何一条线画出之前，就已经写在表上。
Watch out.容易看错的地方。 The drawing places Arts and Engineering apart even when students in the two faculties talk as often as students inside one faculty. The spare-seat news stops at a missing talk, not at the blank on the page.就算两个学院的学生说话和学院内部一样勤，图画仍把文学院和工程学院分开。名额的消息停在缺了的谈话上，不是停在纸上的空白处。