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        "content": "Let's analyze the given information step by step:\n\n1. The number of brothers Anna has is twice the number of sisters Anna has.\n2. The number of sisters Anna has is twice the number of brothers Anna has.\n\nWe can see that these two statements are contradictory. If statement 1 is true, then statement 2 cannot be true, and vice versa.\n\n- If Anna has 'B' brothers and 'S' sisters, then according to statement 1:\n  B = 2S\n\n- However, according to statement 2:\n  S = 2B\n\nThese equations cannot hold true simultaneously, as they imply that B = 4B, which is only possible if B = 0 (and consequently, S = 0).\n\nTherefore, the given information is inconsistent and does not provide a definite answer to whether Anna has any siblings or not. The statements cannot be true at the same time unless Anna has no siblings at all."
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