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