12. (a) N = 2, s = 1/4, so dimension = log(2)/log(4) = 1/2.

(b) N = 2, s = 1/6, so dimension = log(2)/log(6).

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

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

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