Easy 10-minute project. We're a nonprofit and have a retreat where people give presentations. There are 50-80 presenters every year, and each presentation is to be attended by exactly 12 different people, chosen randomly. So we need a quick program that we can run on our computer (a Dell, a Mac, whatever; our office has both) that permits us: (1) to input 50-80 four-digit numbers -- those are the participant numbers for each person, and then (2) spits out (preferably in Excel or something like that), for each participant number, 12 RANDOM participant numbers (i.e., people) who are going to listen to that participant. With the caveat that every person listens to exactly 12 other presenters and every person is listened to by 12 other people. To be clear, the draw process needs to be random; we can't just skip one number so that participant 1 gets listened to by 2-13, 2 gets listened to by 3-14, etc. It's got to be a random draw.