b1617 b1616 b1615 b1618
b1617 0 2.23606797749979 30.7408522978788 108.305124532499
b1616 2.23606797749979 0 188.637217960825 152.420471066061
b1615 30.7408522978788 188.637217960825 0 921.726640604469
b1618 108.305124532499 152.420471066061 921.726640604469 0