mu 1 2 3
mu 3 2 4
mu 4 2 5
mu 4 3 6
mu 6 3 7
pwr 4 2 8
iv 7 9
mu 9 8 10
mu 10 7 11
mu 8 11 10
pwr 19 10 12
mu 7 12 1
iv 5 9
mu 9 8 10
mu 10 5 11
mu 8 11 10
mu 5 10 13
mu 5 4 6
iv 6 9
mu 9 8 10
mu 10 6 11
mu 8 11 10
pwr 6 10 12
mu 13 12 2