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1.e4 e5 2.Nf3 Nc6
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Bb5
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1.e4 e5 2.Nf3 Nc6 3.Bb5
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1.e4 e5 2.Nf3 Nc6 3.Bb5 a6
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Ba4
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1.e4 e5 2.Nf3 Nc6 3.Bb5 a6 4.Ba4