甲、乙、丙、丁四人共同生产一批零件，甲生产的占其他三人生产总数的2/13，乙生产的占其他三人生产总数的1/4，丙生产的占其他三人生产总数的4/11.已知丁生产了60个，甲、乙、丙、丁各生产零件多少个？

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