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