hard Set 3 Unknown

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                    "value": 9,
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                    "value": 12,
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                    "value": 14,
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                {
                    "value": 15,
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            "question": "Find the missing number on the number line (3 to 16, step 1)",
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            "id": 20,
            "type": "number-line",
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            "end": 81,
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                    "value": 46,
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                {
                    "value": 48,
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                {
                    "value": 49,
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                {
                    "value": 50,
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                {
                    "value": 51,
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                    "value": 52,
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                {
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            "question": "Find the missing number on the number line (45 to 81, step 1)"
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