\[\begin{array}{1 1}(1)\overrightarrow{a} parallel\; to \overrightarrow{b}&(2)\overrightarrow{b} parallel\; to\overrightarrow{c}\\(3)\overrightarrow{c} parallel\; to \overrightarrow{a}&(4)\overrightarrow{a}+\overrightarrow{b}+\overrightarrow{c}=\overrightarrow{0}\end{array}\]