mu 1 2 3
mu 3 2 4
mu 3 4 5
mu 3 5 6
mu 6 5 8
pwr 6 3 9
iv 9 10
mu 10 2 11
mu 11 9 1
pwr 3 8 2
pwr 7 4 9
iv 9 10
mu 10 2 11
mu 11 9 2