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Which statements below on computational complexity theory foundations are true 1 There exist questions about context - free languages that are not decidable. 2 Pumping

Which statements below on computational complexity theory foundations are true

1

There exist questions about context

-

free languages that are not decidable.

2

Pumping lemma for regular languages cannot be used to prove that certain languages are not regular.

3

There are no languages which would not be Turing recognizable.

4

Regular languages form a subset of context

-

free languages.

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