Let $$A = \left[\begin{array}{cccc} -10 &-9 &15 &-12\cr 4 &3 &-6 &4\cr 0 &6 &0 &8 \end{array}\right].$$ Find a non-zero vector in the column space of $A$.

$\left[\Rule{0pt}{3.6em}{0pt}\right.$$\left]\Rule{0pt}{3.6em}{0pt}\right.$