13. (a) N = 4, s = 1/4, so dimension = log(4)/log(4) = 1.

(b) N = 4, s = 1/6, so dimension = log(4)/log(6).

(c) N = 4, s = 2/5, so dimension = log(4)/log(5/2).

(d) N = 4, s = (1 - t)/2, so dimension = log(4)/log(2/(1 - t)).

(e) Since log(4) = log(2^{2}) = 2log(2), the dimensions in this problem
are twice those of the corresponding parts of problem 12.

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