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