easy 3×3 Set 3 Unknown

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    "title": "form-exercise set 3",
    "operation": "math-bingo",
    "subject": "arithmetic",
    "difficulty": "easy",
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            "card": [
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                    {
                        "value": 35,
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                    {
                        "value": "FREE",
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                    "problem": "3 × 8",
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                    "problem": "14 - 2",
                    "answer": 12
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                    "problem": "5 + 25",
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                {
                    "problem": "1 × 7",
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                    "problem": "28 - 6",
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                    "problem": "44 - 13",
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                    "problem": "7 × 2",
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                    "problem": "21 - 1",
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                {
                    "problem": "37 × 1",
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                {
                    "problem": "5 × 5",
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                {
                    "problem": "22 - 1",
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                {
                    "problem": "9 × 4",
                    "answer": 36
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                {
                    "problem": "14 + 15",
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            "freeCenter": true,
            "question": "Mark answers on your bingo card as problems are called.",
            "correctAnswer": "bingo"
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