I'm trying to create a spreadsheet where I can 20 golfers playing over 3 days and none of the golfers play with each other twice. On each team will be two "A" players and two "B" players. I've figured out how to make the 1st day random but I can't figure out out to make days 2 & 3 where the players don't play with each other again. Please help! I've been trying for half a day to figure this out. Is there a program to do this?