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 7 8 9
mu 9 9 10
mu 3 3 5
mu 3 5 6
iv 6 7
mu 6 1 8
mu 8 7 1
iv 4 5
mu 5 10 6
mu 6 4 2
