mu 1 2 3
mu 3 2 4
mu 3 4 5
mu 3 5 6
mu 6 3 7
mu 7 4 8

mu 5 8 9
mu 9 9 10
mu 10 10 11
mu 9 11 10
iv 4 9
mu 9 10 11
mu 11 4 1

mu 5 7 9
mu 5 8 10
mu 9 10 11
mu 11 11 9
mu 9 11 2