mu 1 2 3
mu 3 2 4
mu 3 4 5
mu 3 5 6
mu 6 3 7
pwr 3 3 8
iv 8 9
mu 9 2 10
mu 10 8 1
mu 3 7 2
iv 4 5
mu 5 2 3
mu 3 4 2