chor 1 2
chor 2 4
mu 1 2 3
chor 3 11
mu 3 2 4
chor 4 6
iv 2 5
mu 1 5 6  # ab^-1
mu 3 3 7  # abab
mu 7 6 8  # abababi
mu 8 3 9  # abababiab
mu 9 4 10
mu 10 6 11
mu 11 3 12
mu 12 6 13
mu 13 6 14
chor 14 1