22.(a) N(1/4) = 2*4, N(1/4^{2}) = 4*16 = 2^{2}*4^{2}, ... ,
N(1/4^{n}) = 2^{n}*4^{n}= (2*4)^{n}.

(b) The box-counting dimension is log((2*4)^{n})/log(4^{n}) =
(log(2) + log(4))/log(4) = (log(2)/log(4)) + 1 = dimension of the Cantor set +
dimension of the interval.

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