When the function is not constant

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The discussion centers on the functions f1 and f2 defined on the set {0,1,...,24}, where f1(k) = k + 1 for k < 24 and f2(k) = k for k < 24, with both functions returning 0 at k = 24. The goal is to determine the maximum value of m such that the composite function gi1, i2, ..., im(k) = fi1(fi2(...fim(k)...)) remains non-constant for any selection of indices i1, i2, ..., im from {1,2}. The lack of definitions for g_{iM} in relation to f_{iM} creates ambiguity in the analysis.

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Let f1, f2: {0,1, ..., 24} → {0,1, ..., 24} be such functions that f1 (k) = k + 1 for k <24, f2 (k) = k for k <24 and f1 (24) = f2 (24) = 0. Let gi1, i2, ..., I am (k) = fi1 (fi2 (... fim (k) ...)) for i1, i2, ..., im∈ {1,2}. Find the largest m for which irrespective of the selection i1, i2, ..., im∈ {1,2} function gi1, i2, ..., I am is not a constant function.
 
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You have defined $f_1$ and $f_2$ but to define $g_{iM}$ you refer to $f_{iM}$ which have NOT been defined.
 
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