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Gr1_1-step (__ - 8 = 6)
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Gr1_1-step (13 - __ = 8)
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Gr1_1-step with extra info (9 + __ = 16)
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Gr1_2-step (9 + 6 - 3 = n)
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Gr1_One-step (__ - 4 = 12)