A football tournament is about to happen and the schedule has to be set so each team will be able to play against each other. As you know matches are played once a week and each team plays 1 match in a week. The schedule has to be prepared according to this. The tournament which happens with 6 teams: A) The definition of the problem B) The definition of the problem in Graf way and the example draw for 6 teams. C) Write down the tournament schedule for the 6 teams by Graf.