title: Find a 4 points that form a tetrahedron around some point
body: <p>There is an array of points in 3 dimentions. <code>1 = {x,y,z}; 2 = {x,y,z}; 3 = {x,y,z}, ... n = {x,y,z}</code>. Also we have a point <code>t = {x,y,z}</code>.
  How to spot a 4 points that form a tetrahedron around point <code>t</code>?</p>