iv 1 3
pwr 2 3 4
iv 2 5
mu 4 5 6
pwr 2 1 7
mu 7 2 8
mu 6 8 9
chor 9 1
pwr 3 2 4
chor 4 1
mu 2 1 4
mu 1 4 5
pwr 2 4 6
mu 5 6 7
mu 1 2 8
mu 2 8 9
pwr 2 8 10
mu 9 10 11
mu 7 11 12
chor 12 1
iv 2 4
mu 1 4 5
mu 1 2 6
mu 5 6 7
iv 1 8
mu 8 4 9
mu 9 6 10
mu 7 10 11
pwr 2 10 12
mu 11 12 13
chor 13 1