mu 1 2 3 mu 3 2 4 mu 3 4 5 mu 3 5 6 mu 6 3 7 mu 7 4 8 mu 7 8 9 mu 9 9 10 mu 3 3 5 mu 3 5 6 iv 6 7 mu 7 1 8 mu 8 6 1 mu 4 4 5 mu 4 5 6 mu 6 6 7 iv 7 8 mu 8 10 9 mu 9 7 2