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    String formed by the last 4 elements mod 10

    Example of string: 1 5 1 9 6 1 7 3 7 8 5 3 3 9 0 5 7 1 3 6 7 7 3 3 0 and so on. The first 4 elements are random. The fifth one , that is 6, is the sum of the first 4 elements mod 10, the sixth one is obtained by the same principle and so on. What I have noticed is that every five consecutive...
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