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class Solution:
    def readBinaryWatch(self, num: int) -> List[str]:
        """copy from 思君满月"""
        ret = []
        for hour in range(12):
            
            for minute in range(60):
                if (bin(hour) + bin(minute)).count('1') == num:
                    ret.append('%d:%02d' % (hour, minute))
                    
        return ret