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if sigma $=\{$a$,$b$\}$

and L $=\{$ab$,$ ba$\},$ which of the following languages represent

$?$

Question $1$ options:

$\{$abab$,$ abba, baab, baba$\}$

$\{$abab$,$ abba$\}$

$\{$abab$,$ baba$\}$

$\{$ab$,$ ba$,$ abab, baba$\}$