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

