mu 1 2 3
mu 1 3 14
mu 2 1 4
iv 2 5
mu 4 5 6
mu 6 3 7
mu 7 7 8
mu 8 8 7
mu 1 8 9
mu 9 7 1
mu 3 2 4
mu 4 2 5
mu 5 2 6
mu 6 2 7
mu 7 2 8
mu 8 2 9
mu 9 2 10
mu 7 10 11
iv 11 12
mu 12 1 13
mu 13 11 2
pwr 7 14 15
mu 8 3 16
mu 4 10 17
mu 15 16 4
mu 4 17 3
oup 3 1 2 3