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Which one of the following regular expressions can generate the word abb? 1. a*(bbb + ba)*b* 2. (ab)* 3. a(bb)*a 4. (aa + b)*

Which one of the following regular expressions can generate the word abb?

1. a*(bbb + ba)*b*

2. (ab)*

3. a(bb)*a

4. (aa + b)*

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