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