chor 1 2
chor 2 3
mu 1 2 3
chor 3 31
mu 3 2 4
pwr 4 3 5
mu 4 3 6
mu 6 4 7
pwr 3 7 6
mu 5 6 7
mu 7 5 8
mu 8 4 5
mu 5 4 6
chor 6 1