b2531 b2530 b2529 b2528
b2531 0 1.41421356237309 2 3.46410161513775
b2530 1.41421356237309 0 1 3
b2529 2 1 0 2.44948974278318
b2528 3.46410161513775 3 2.44948974278318 0