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