Function Machine Multiplication Expert — Set 73

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                "input": 1,
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                "rule": "×3",
                "input": 6,
                "output": 18,
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                "correctAnswer": "18",
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                "id": 4,
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                "rule": "×2",
                "input": 2,
                "output": 4,
                "question": "? → [×2] → 4",
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                "correctAnswer": "2",
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            {
                "id": 5,
                "type": "function-machine",
                "subType": "find-input",
                "rule": "+5",
                "input": 5,
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                "question": "? → [+5] → 10",
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            {
                "id": 6,
                "type": "function-machine",
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                "rule": "×2 + 3",
                "input": 6,
                "output": 15,
                "question": "Input: 6 → [×2 + 3] → ?",
                "answer": 15,
                "correctAnswer": "15",
                "difficulty": "expert"
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            {
                "id": 7,
                "type": "function-machine",
                "subType": "find-output",
                "rule": "+5",
                "input": 9,
                "output": 14,
                "question": "Input: 9 → [+5] → ?",
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                "correctAnswer": "14",
                "difficulty": "expert"
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                "id": 8,
                "type": "function-machine",
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