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Just collapse allreplace Kleene stars, with $\epsilon$ to find the basis and position, then extend to both direction.
$B=\{\epsilon\}$
$\mathcal{F}=\{X\to0X|10X|X1\}$
$L_1 = \langle B \rangle_{\mathcal{F}}$
Just collapse all Kleene stars, find the basis and position, then extend to both direction.
Just replace Kleene stars with $\epsilon$ to find the basis and position, then extend to both direction.
