Formal grammars

You have the following grammar:

$$N = \{A, B, C, D, E, F\}, \Sigma = \{a, b\}$$

$$P= \{S \to AB, S \to ABAB, S \to CD, S \to EFAB, A \to a, B \to b, C \to a_3, D \to b_3, E \to a_2, F \to \varepsilon_3\}$$

$S$ is the start symbol.

Please, type all strings that this grammar can generate. Separate each string by a space, like in the following example:

a bab bbaa