mu 1 2 3
mu 3 2 4
mu 3 4 5
mu 3 5 6
mu 6 3 7
mu 7 4 8
mu 3 8 9
mu 4 5 10
mu 10 8 11
mu 6 11 1
mu 9 11 12
mu 12 5 13
mu 13 8 2
pwr 12 1 5
pwr 15 2 6
mu 5 6 12
pwr 10 12 13
iv 13 14
mu 14 2 15
mu 15 13 2