4*2^4 *(2^6)^2 : [(2^4:2)^2]^3 ?
= 2^2*2^4*2^12 : [(2^3)^2]^3 =
= 2^(2+4+12) : 2^(3*2*3) =
= 2^18 : 2^18 = 1
oppure 2^(18-18) = 2^0 = 1
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