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2014-10-02T18:46:19+02:00
128 = 2^7 ; 4³ = 2^6 ; 32 = 2^5 ; 8 = 2^3
D = (2^7x2^4x2^6)/(2³x2^5x2²x2³) = 2^17/2^13 = 2^4