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