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