mu 1 2 3 mu 3 2 4 mu 3 4 5 mu 5 2 9 mu 3 5 6 mu 6 3 7 mu 7 7 8 mu 7 8 2 pwr 7 9 3 iv 3 4 mu 3 1 5 mu 5 4 1 pwr 25 6 8 iv 8 7 mu 7 2 3 mu 3 8 2