Mark all languages that are deterministic context-free:
$\{a^nb^n: n \ge 1\} \cup \{a\}$
$\{ww^R: w \in \{a,b\}^*\}$
$\{a^nb^m: m \ge n + 3 \text{ and } n > 0\}$
$\{a^nb^m: n < 2 \times m \text{ and } m > 0\}$
$\{a^nb^mc^k: (n = m \text{ or } m = k) \text{ and } n,m,k \ge 0\}$
$\{a^nb^n: n > 0\} \cap \{x \in \{a,b\}^*: |x|_a \text{ is even}\}$
