b2177 b2178 b2179 b2180
b2177 0 9.53939201416945 52.6497863243527 1.41421356237309
b2178 9.53939201416945 0 5.47722557505166 4.89897948556636
b2179 52.6497863243527 5.47722557505166 0 1
b2180 1.41421356237309 4.89897948556636 1 0