9000101802

Among vectors $\overrightarrow{u}=(-\frac{2}{\sqrt{2}};2\sqrt{2})$, $\overrightarrow{v}=(-5;10)$, $\overrightarrow{w}=(2.5;-5)$, $\overrightarrow{r}=(-3.5;6)$ find the vector which is not parallel to the vector $\overrightarrow{a}=(1;-2)$.