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1.e4 c5 2.d4 cxd4
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1.e4 c5 2.d4 cxd4 3.Qxd4
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1.e4 c5 2.d4 cxd4 3.Qxd4 nc6
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1.e4 c5 2.d4 cxd4 3.Qxd4 nc6 4.Qa4