I will tell you about the system of the tournament. If we gather 8 teams, then each group will contain 4 teams. From the group comes first 2 teams that will be determined by quantity of points. With result 2:0 winning team will receive 3 points (lost team - 0pts), and with result 2:1 winning team will receive 2pts and lost team - 1pts. The first four teams will go to the semifinals. The team which won first place in Group A play with the team which took 2nd place in group B. Also, the second pair of semifinals - B1 vs. A2. Four teams, which did not come from the group will fight for a 5-8th place round robin. If we gather 6 teams, then 2 teams will play for the 5-6th places, which did not come from the group.