B Set 69 Unknown

This page uses a content type that does not have a custom renderer yet. Raw structured data is shown below.

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        "subject": "arithmetic",
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                "rule": "×2 + 1",
                "input": 1,
                "output": 3,
                "question": "Input: 1 → [?] → 3, what is the rule?",
                "answer": "×2 + 1",
                "correctAnswer": "×2 + 1",
                "difficulty": "expert"
            },
            {
                "id": 2,
                "type": "function-machine",
                "subType": "find-rule",
                "rule": "+2",
                "input": 8,
                "output": 10,
                "question": "Input: 8 → [?] → 10, what is the rule?",
                "answer": "+2",
                "correctAnswer": "+2",
                "difficulty": "expert"
            },
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                "id": 3,
                "type": "function-machine",
                "subType": "find-rule",
                "rule": "×2 + 3",
                "input": 9,
                "output": 21,
                "question": "Input: 9 → [?] → 21, what is the rule?",
                "answer": "×2 + 3",
                "correctAnswer": "×2 + 3",
                "difficulty": "expert"
            },
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                "id": 4,
                "type": "function-machine",
                "subType": "find-output",
                "rule": "×2 + 3",
                "input": 10,
                "output": 23,
                "question": "Input: 10 → [×2 + 3] → ?",
                "answer": 23,
                "correctAnswer": "23",
                "difficulty": "expert"
            },
            {
                "id": 5,
                "type": "function-machine",
                "subType": "find-input",
                "rule": "-1",
                "input": 8,
                "output": 7,
                "question": "? → [-1] → 7",
                "answer": 8,
                "correctAnswer": "8",
                "difficulty": "expert"
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            {
                "id": 6,
                "type": "function-machine",
                "subType": "find-input",
                "rule": "+5",
                "input": 8,
                "output": 13,
                "question": "? → [+5] → 13",
                "answer": 8,
                "correctAnswer": "8",
                "difficulty": "expert"
            },
            {
                "id": 8,
                "type": "function-machine",
                "subType": "find-output",
                "rule": "+2",
                "input": 2,
                "output": 4,
                "question": "Input: 2 → [+2] → ?",
                "answer": 4,
                "correctAnswer": "4",
                "difficulty": "expert"
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