chor 1 2
chor 2 13
mu 1 2 3
chor 3 11
mu 3 2 4
chor 4 21
com 1 2 5
chor 5 3

mu 2 2 6  #b^2
com 1 6 7
chor 7 3

mu 6 2 8
com 1 8 9
chor 9 3

mu 8 2 10 #b^4
com 1 10 11
chor 11 2

mu 10 2 12
com 1 12 13
chor 13 3

mu 2 4 14 #bab^2
com 1 14 15
chor 15 3

iv 2 16
mu 16 16 17
mu 16 1 18
mu 18 17 19
com 1 19 20
chor 20 2

mu 2 1 21
mu 21 12 22
com 1 22 23
chor 23 2

mu 2 22 24
com 1 24 25
chor 25 2