in Theory of Computation
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Which of the following languages is regular?

  1. $\left\{ww^R \mid w \in \{0, 1\}^+\right\}$

  2. $\left\{ww^Rx \mid x,w  \in \{0, 1\}^+\right\}$

  3. $\left\{wxw^R \mid x, w \in \{0, 1\}^+\right\}$

  4. $\left\{xww^R \mid x, w \in \{0, 1\}^+\right\}$

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