mu 1 2 3
mu 3 2 4
mu 4 2 5
mu 5 2 6
pwr 3 6 3
pwr 3 4 7
mu 5 4 8
mu 8 8 9
iv 7 10
mu 3 10 11
mu 11 3 12
mu 12 7 11
mu 7 11 1
iv 9 10
mu 3 10 11
mu 11 3 12
mu 12 9 11
pwr 17 11 12
mu 9 12 2