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

pwr 6 6 1

pwr 7 5 6
mu 3 3 4

mu 7 7 5

mu 4 6 8

iv 8 9
mu 9 5 7
mu 7 8 2