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