We apply the endomorphism g over four letters { a,b,c,d } to g85(a), where g

is defined by the productions g: a → g85a, b → g85b, c → g85d, d → g85c.

The word obtained, i.e., g(g85(a)), is represented by a 85 x 85 matrix.

Below we put colour on letters and highlight some diagonals that indicate

permutative reappearance of quite long factors of g85(a). The factors

do not reappear as such but in the structural sense, i.e., with letters renamed.

Backwords leaning diagonals represent reappearances of previous factors in the form of semi-mirror images.

Those backwords leaning diagonals that cross the main diagonal represent semi-palindrome factors of g85(a).

© 2004 V. Keränen

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Created by Mathematica (October 6, 2004)