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1.e4 g6 2.d4 Bg7 3.Nc3
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1.e4 g6 2.d4 Bg7 3.Nc3 d6
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1.e4 g6 2.d4 Bg7 3.Nc3 d6 4.f4
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1.e4 g6 2.d4 Bg7 3.Nc3 d6 4.f4 Nc6