chor 1 2
chor 2 3
mu 1 2 3
chor 3 10
iv 2 4
mu 1 4 5  # cd^-1
mu 3 3 6  # cdcd
mu 6 5 7
chor 7 4
mu 2 3 8   # dcd
pwr 3 5 9
mu 8 9 10
mu 10 6 11
com 1 11 12
chor 12 1