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Regular expression for language with even number of 0's and 1's [duplicate]

Let $\Sigma=\{0,1\}$. What is the regular expression for the language of all strings with an even number of $0$'s and an even number of $1$'s? If we only require an even number of $0$'s, the language ...
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Expert explanation of state elimination methods [duplicate]

I'm so sorry if this question is too general, but I need to understand the general process of the "State elimination method". In other words, what is the general idea, and what is the ...