b0775 b0776 b0777 b0778
b0775 0 2 1.73205080756888 4
b0776 2 0 1.41421356237309 3.46410161513775
b0777 1.73205080756888 1.41421356237309 0 2
b0778 4 3.46410161513775 2 0