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1.d4 d5 2.Bf4 Nf6
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1.d4 d5 2.Bf4 Nf6 3.e3
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1.d4 d5 2.Bf4 Nf6 3.e3 e6
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Nf3
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1.d4 d5 2.Bf4 Nf6 3.e3 e6 4.Nf3