Short sequence
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If we subtract the first number from 61 we get the last; if we subtract the second number from 61 we get the second to last; if we subtract the third number from 61 we get the third from last; if we subtract the fourth from 61 we get the fourth from last. If we subtract the fifth from 61 we get 30 but the fifth from last is the middle number which we subtracted from 61 already.

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