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 4 10

pwr 6 5 11
pwr 4 3 12
mu 12 11 13
mu 4 10 11
iv 13 12
mu 12 11 14
mu 14 13 12

mu 2 12 15

mu 15 12 13

mu 15 13 14

mu 15 15 6
mu 14 14 7
mu 6 7 8
mu 8 13 9

mu 2 9 1
iv 15 4
iv 4 2