\(a\)，\(b\)，\(c\)为三条不重合的直线，\(\alpha \)，\(\beta \)，\(\gamma \)为三个不重合平面，现给出四个命题：

\(①\left. \begin{matrix} & a\parallel \gamma \\ & b\parallel \gamma \\ \end{matrix} \right\}\Rightarrow a\parallel b\)；\(②\left. \begin{matrix} & \alpha \parallel c \\ & \beta \parallel c \\ \end{matrix} \right\}\Rightarrow \alpha \parallel \beta \)；\(③\left. \begin{matrix} & \alpha \parallel \gamma \\ & \beta \parallel \gamma \\ \end{matrix} \right\}\Rightarrow \alpha \parallel \beta \)；\(④\left. \begin{matrix} & \alpha \parallel c \\ & a\parallel c \\ \end{matrix} \right\}\Rightarrow \alpha \parallel a.\)其中正确的是\((\)   \()\)．