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(2^n+2)-2^2 × 2^2n per 2^2n+4 - 2^2 × 2^2n = 2^2n+4 - 2^2 × 2^2n per 2^2n + 2
= 2^2n × 2^4 - 2^2 × 2^2n per 2^2n × 2^2
= (2^4-2^2) per 2^2
= 16-4 per 4
= 3