Subtraction Number Range Within 50 — Set 72

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                "operand1": 16,
                "operand2": 15,
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                "operand1": 28,
                "operand2": 12,
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                "question": "28 - 12 = ___",
                "answer": 16
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                "operand1": 17,
                "operand2": 1,
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                "question": "17 - 1 = ___",
                "answer": 16
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            {
                "id": 6,
                "operand1": 16,
                "operand2": 1,
                "operator": "-",
                "question": "16 - 1 = ___",
                "answer": 15
            },
            {
                "id": 7,
                "operand1": 17,
                "operand2": 4,
                "operator": "-",
                "question": "17 - 4 = ___",
                "answer": 13
            },
            {
                "id": 8,
                "operand1": 4,
                "operand2": 3,
                "operator": "-",
                "question": "4 - 3 = ___",
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            {
                "id": 9,
                "operand1": 26,
                "operand2": 23,
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                "question": "26 - 23 = ___",
                "answer": 3
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            {
                "id": 10,
                "operand1": 26,
                "operand2": 3,
                "operator": "-",
                "question": "26 - 3 = ___",
                "answer": 23
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                "id": 11,
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                "operand2": 1,
                "operator": "-",
                "question": "3 - 1 = ___",
                "answer": 2,
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            {
                "id": 12,
                "operand1": 42,
                "operand2": 12,
                "operator": "-",
                "question": "42 - 12 = ___",
                "answer": 30
            },
            {
                "id": 13,
                "operand1": 28,
                "operand2": 13,
                "operator": "-",
                "question": "28 - 13 = ___",
                "answer": 15
            },
            {
                "id": 14,
                "operand1": 48,
                "operand2": 38,
                "operator": "-",
                "question": "48 - 38 = ___",
                "answer": 10
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            {
                "id": 15,
                "operand1": 47,
                "operand2": 17,
                "operator": "-",
                "question": "47 - 17 = ___",
                "answer": 30
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                "id": 16,
                "operand1": 31,
                "operand2": 30,
                "operator": "-",
                "question": "31 - 30 = ___",
                "answer": 1
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            {
                "id": 17,
                "operand1": 36,
                "operand2": 33,
                "operator": "-",
                "question": "36 - 33 = ___",
                "answer": 3
            },
            {
                "id": 18,
                "operand1": 42,
                "operand2": 2,
                "operator": "-",
                "question": "42 - 2 = ___",
                "answer": 40
            },
            {
                "id": 19,
                "operand1": 5,
                "operand2": 4,
                "operator": "-",
                "question": "5 - 4 = ___",
                "answer": 1,
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            {
                "id": 20,
                "operand1": 23,
                "operand2": 12,
                "operator": "-",
                "question": "23 - 12 = ___",
                "answer": 11
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