2Y5, 1M3, 2V2, 1S8
8754, 9786, 7986, 5364
679, 888, 945, 943
5-15-20, 10-30-40, 4-12-15, 25-50-75
81:243, 16:64, 64:192, 25:75
1. 6, 18, 24, 120