$\left(-\infty,0\right)\cup\left(0,+\infty\right)$\left(-\infty,0\right)\cup\left(0,+\infty\right)

$\left(-\infty,0\right)\cup\left(0,1\right)\cup\left(1,+\infty\right)$\left(-\infty,0\right)\cup\left(0,1\right)\cup\left(1,+\infty\right)

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

$\left(-\infty,1\right)\cup\left(1,5\right)\cup\left(5,+\infty\right)$\left(-\infty,1\right)\cup\left(1,5\right)\cup\left(5,+\infty\right)