help with arithmetic on a DNA sequence calculation

[S. A. Modena]

If anyone has this article nearby:

        Long-range correlations in nucleotide sequences
        C.-K. Peng et al.
        Nature 356:168-70 (12 March) 1992

I would appreciate alittle help on the defining the arithmetic
steps for doing the calculations that the article is based on.

---Steve
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