is there a solution for dataset 2?
No. If you draw these as triangles,
you should see 2 equalateral
triangles, and one that isn't.
You cannot fit the third triangle
into spaces left by the first two.
9
{1,4, 7}
{1,4, 7}
{1,4, 6}
{1,4, 7}
{1,4,
{1,4, 6}