A . Z=0.05a+0.25b+0.35c+0.25d+0.05e+0.05fB . Z=0.25a+0.05b+0.35c+0.25d+0.05e+0.05fC . Z=0.05a+0.25b+0.25c+0.25d+0.15e+0.05fD . Z=0.05a+0.25b+0.15c+0.25d+0.15e+0.15f
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