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Two labs on the same 40 students, 20 in Arts and 20 in Engineering. The first records who talked to whom last month. The second starts a clinic notice at one Engineering student and lets it pass along those talks.两个实验用同一批 40 名学生，文学院 20 人、工程学院 20 人。第一个记录上个月谁和谁说过话。第二个从工程学院的一名学生发出诊所通知，并让它沿着这些谈话传。
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在表上。
A pitfall.一个陷阱。 The drawing places Arts and Engineering apart even when students in the two faculties talk as often as students inside one faculty. The clinic notice stops at a missing talk, not at the blank on the page.即使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放开。诊所通知停在缺失的谈话上，不是停在纸上的空白处。