Let $$S = S_1 \cap S_2 \cap S_3$$, where
$$S_1 = \left\{z \in C: \mid z \mid < 4\right\}, S_2 = \left\{z \in C: Im\left[\frac{z - 1 + \sqrt{3} i}{1 - \sqrt{3} i}\right]> 0\right\}$$ and $$S_3 = \left\{z \in C: Rez > 0\right\}.$$
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