$\left(2,\ 4\right)\ and\ \left(8,\ \infty\right)$ 

 $\left(-\infty,\ 1\right)\ and\ \left(8,\ \infty\right)$ 

 $\left(-\infty,1\right),\ \left(-3,\ 1\right)\ and\ \left(8,\ \infty\right)$ 

 $\left(-\infty,\ 1\right),\ \left(2,\ 4\right)\ and\ \left(8,\ \infty\right)$ 

$\left(-\infty,\ 1\right)$

$\left(-\infty,\ 2\right)$

$\left(2,\ \infty\right)$

$\left(1,\ \infty\right)$

$\left(-\infty,\ 1\right)$

$\left(-\infty,\ 2\right)$

$\left(2,\ \infty\right)$

$\left(1,\ \infty\right)$

$\left(-\infty,\ -3\right)$

$\left(-\infty,\ -4\right)$

$\left(-4,\ \infty\right)$

$\left(-3,\ \infty\right)$

$\left(-\infty,\ -3\right)$

$\left(-\infty,\ -4\right)$

$\left(-4,\ \infty\right)$

$\left(-3,\ \infty\right)$

$\left(-\infty,\ -15\right)\ and\ \left(9,\ -15\right)$

$\left(-2,\ 9\right)\ and\ \left(2,\ \infty\right)$

$\left(-\infty,\ -2\right)\ and\ \left(0,\ 2\right)$

$\left(-2,\ 0\right)\ and\ \left(2,\ \infty\right)$

$\left(-\infty,\ -15\right)\ and\ \left(9,\ -15\right)$

$\left(-2,\ 9\right)\ and\ \left(2,\ \infty\right)$

$\left(-\infty,\ -2\right)\ and\ \left(0,\ 2\right)$

$\left(-2,\ 0\right)\ and\ \left(2,\ \infty\right)$