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The ___________ automaton is a type of automaton that can recognize regular languages and is equivalent in expressive power to regular expressions.

A ___________ grammar is a type of grammar that generates context-free languages and is commonly used to describe the syntax of programming languages.

The ___________ is a theoretical machine that can decide whether an arbitrary Turing machine with a given input will halt or run forever.

The ___________ is a language that can be recognized by a Turing machine but cannot be decided by it, highlighting the difference between recognition and decidability.

The ___________ is a complexity class representing decision problems that can be solved by a nondeterministic Turing machine in polynomial time.