mu 1 2 3
mu 3 2 4
mu 4 2 5
mu 5 2 6
mu 6 3 7
pwr 6 7 8
mu 5 5 9
mu 9 4 10
mu 10 3 9
mu 9 6 10
iv 10 11
mu 11 8 7
mu 7 10 2
