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B = [(Z1 + Z3 - Z7 - Z9) /4 - (Z2 - Z8) /2] /L3

C = [(-Z1 + Z3 - Z7 + Z9) /4 + (Z4 - Z6)] /2] /L3

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F = (-Z1 + Z3 + Z7 - Z9) /4L2

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