form point 2 3 to point 2 6 step is 1
form point 2 3 to point 2 7 step is 1
form point 2 6 to point 1 6 step is 2
form point 2 6 to point 9 6 step is 2
form point 2 6 to point 2 3 step is 2
form point 2 7 to point 10 7 step is 2
form point 1 6 to point 1 1 step is 3
form point 10 7 to point 10 4 step is 3
form point 1 1 to point 6 1 step is 4
form point 6 1 to point 6 8 step is 5
form point 6 8 to point 4 8 step is 6
form point 6 8 to point 7 8 step is 6
7