Among the 1997 numbers 1, 2, ..., 1997, select some numbers so that the sum of every two numbers in these numbers can be divisible by 22, then, how many such numbers can be selected at most?
在1，2，…，1997这1997个数中，选出一些数，使得这些数中的每两个数的和都能被22整除，那么，这样的数最多能选出多少个．
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