$k$ is algebraically closed in $K$, and $lK=L$ , but $l$ is not algebraically closed in $L$.

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Give an example of fields $k \subset K \subset L$ and $l \subset L$ for which $l/k$ and $L/K$ are algebraic, $k$ is algebraically closed in $K$, and $lK=L$ , but $l$ is not algebraically closed in $L$.

Difficulty in figuring out an example.