问题描述：
下面的3组数中各缺少一个数字,请根据数字的排列规律填空.
1.one three two four three five four six ------
2.one two six twenty-four one hundred and twenty ------
3.six eleven sixteen twenty-one ------
1.one three two four three five four six ------
2.one two six twenty-four one hundred and twenty ------
3.six eleven sixteen twenty-one ------
问题解答：
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