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