(1+1/2)(1+1/4)(1+1/16)(1+1/256)=(1-0.5)(1+0.5)(1-0.25)(1+0.25)(1+1/16)(1+1/256)/(1-0.5)=1-1/256^2
(1+1/2)(2+1/4)(1+1/16)(1+1/256)
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