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