mu 1 2 3
mu 3 2 4
pwr 4 2 5
mu 1 5 6
mu 4 5 7
mu 4 3 8
mu 8 8 9
mu 6 9 10
mu 3 4 9
mu 9 7 11
iv 11 12
mu 12 10 9
mu 9 11 2
