# Peter Linz Edition 5 Exercise 11.4 Question 1 (Page No. 298)

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Given examples that demonstrate that all the subset relations depicted in the figure are indeed proper ones.

## Related questions

1
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Find two examples of languages that are deterministic context-free but not linear.
Let $L$ be a context-free language. Show that then $L^+$ is recusively enumerable. Suggest an enumeration procedure for it.