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