$4/3 \in (1, 2)$

$\{x \mid x \in \mathbb{R}, -2 \le x \le -1\}$

$\sqrt{6} \in (2, 3)$

$\{x \mid x \in \mathbb{R}, -2 \le x \le 0\}$

$0 \in (-2, 5]$

$\{x \mid x \in \mathbb{R}, -1 \le x \le 2\} \subseteq (-1, 2)$

$\{x \mid x \in \mathbb{R}, -1 < x < 1\} \subseteq (-1, 2)$

$[2, 5] = (2, 5)$

$\emptyset \subseteq (-1, 2]$