If $$u = \left[\begin{array}{c} -6\cr 1\cr -6 \end{array}\right]$$ then

$u u^T =$ $\left[\Rule{0pt}{3.6em}{0pt}\right.$$\left]\Rule{0pt}{3.6em}{0pt}\right.$ and $u^T u =$ $\left[\Rule{0pt}{1.2em}{0pt}\right.$$\left]\Rule{0pt}{1.2em}{0pt}\right.$.