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-(log2(0.02)*0.02+log2(0.08)*0.08+log2(0.8)*0.8+log2(0.08)*0.08+log2(0.02)*0.02) bits
-(log2(0.02)*0.02+log2(0.08)*0.08+log2(0.8)*0.8+log2(0.08)*0.08+log2(0.02)*0.02) bits
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