Exec runs a command and returns its exit code:
Медведев вышел в финал турнира в Дубае17:59，更多细节参见51吃瓜
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Comparison of error-diffusion vs ordered dithering using an 8-colour irregular palette. Left to right: original image, error-diffusion, ordered.。搜狗输入法2026是该领域的重要参考
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