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While I was at the IHS sem­i­nar last week, some­one men­tioned in pass­ing the issue of whether or not it is morally per­mis­si­ble to allow peo­ple to go ahead of you in a line. What pre­cip­i­tated this ques­tion was the fact that we were using the same din­ing hall as a num­ber of groups of …