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1.d4 d5 2.c4 e6

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1.d4 d5 2.c4 e6 3.Nc3

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1.d4 d5 2.c4 e6 3.Nc3 b6

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1.d4 d5 2.c4 e6 3.Nc3 b6 4.Nf3

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1.d4 d5 2.c4 e6 3.Nc3 b6 4.Nf3 Nf6