B Set 28 Unknown

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                "id": 1,
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                "operand1": 13,
                "operand2": 8,
                "result": 5,
                "question": "13 ○ 8 = 5, what is ○?",
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                "question": "20 ○ 10 = 2, what is ○?",
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                "operand1": 70,
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                "question": "70 ○ 10 = 7, what is ○?",
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                "id": 7,
                "type": "missing-operator",
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                "question": "14 ○ 7 = 7, what is ○?",
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                "id": 10,
                "type": "missing-operator",
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                "operand1": 11,
                "operand2": 5,
                "result": 6,
                "question": "11 __ 5 = 6",
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                "id": 11,
                "type": "missing-operator",
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                "operand2": 5,
                "result": 12,
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                "id": 12,
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                "question": "36 __ 6 = 6",
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                "id": 14,
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                "operand1": 3,
                "operand2": 4,
                "result": 12,
                "question": "3 __ 4 = 12",
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            {
                "id": 15,
                "type": "missing-operator",
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                "operand1": 7,
                "operand2": 8,
                "result": 56,
                "question": "7 ○ 8 = 56, what is ○?",
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                "id": 16,
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                "question": "5 __ 2 = 3",
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                "id": 17,
                "type": "missing-operator",
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                "id": 18,
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                "operand2": 2,
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                "question": "10 ○ 2 = 12, what is ○?",
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                "id": 19,
                "type": "missing-operator",
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                "operand1": 48,
                "operand2": 6,
                "result": 8,
                "question": "48 ○ 6 = 8, what is ○?",
                "answer": "÷",
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                "difficulty": "normal"
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                "id": 20,
                "type": "missing-operator",
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                "operand1": 10,
                "operand2": 6,
                "result": 60,
                "question": "10 __ 6 = 60",
                "answer": "×",
                "correctAnswer": "×",
                "difficulty": "normal"
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