The set of regular expressions over an alphabet is defined recursively. The base for the definition is the statement that ._____ The recursion for the definition specifies that if r and s are any regular expressions over ∑ , then the following arc also regular expressions in the set _____, ______, and ._________

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The set of regular expressions over an alphabet is defined recursively. The base for the definition is the statement that .___ The recursion for the definition specifies that if r and s are any regular expressions over ∑ , then the following arc also regular expressions in the set _, , and ._____

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