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例如： ↵
2^4:10000 ，则在此情况下，在10000到11111这些数中，任意两个数XOR，结果都小于10000。 而若是10000(2^k)与比他小并相邻的数(1111)XOR，则会得到2^k级的最大数
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For example: $2^4$ can be expressed as 10000 ↵
So under this definition :↵
1. Numbers between 10000 and 11111 , any two numbers do the XOR operation , the result will lower than 10000.↵
2. If 10000 XOR with 1111 , one number smaller than 10000 , we'll get the maximum in the level of $2^k$ : 11111.
