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