1. F F
F F F F
F F F F F F+ = F , + =
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1. F F F F F
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F F F F
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2. F F
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3. F F 2 F F F 4 F
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2 F , F , , F , F
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F
F (F ) (F ) ( )
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F ( F )
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3. F
F F
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. F F F . F F F F
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. . F F
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