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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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### What is the procedure for converting this finite automaton into a regular expression? [duplicate]

Could someone provide an explanation of how to convert this DFA into a regular expression? I have found three methods online, ie: How to convert finite automata to regular expressions? but they are ...