Three non-zero non-collinear vectors $\overline{\mathrm{a}},\overline{\mathrm{b}},\overline{\mathrm{c}}$are such that $\overline{\mathrm{a}} + 3\overline{\mathrm{b}}$ is collinear with $\overline{\mathrm{c}}$ , while $\overline{\mathrm{c}}$ is $3\overline{\mathrm{b}} + 2\overline{\mathrm{c}}$ collinear with $\overline{\mathrm{a}}$ . Then $\overline{\mathrm{a}} + 3\overline{\mathrm{b}} + 2\overline{\mathrm{c}} =$