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            "questionId": "1842",
            "questionFrontendId": "1699",
            "categoryTitle": "Database",
            "boundTopicId": 537266,
            "title": "Number of Calls Between Two Persons",
            "titleSlug": "number-of-calls-between-two-persons",
            "content": null,
            "translatedTitle": "两人之间的通话次数",
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            "sampleTestCase": "{\"headers\":{\"Calls\":[\"from_id\",\"to_id\",\"duration\"]},\"rows\":{\"Calls\":[[1,2,59],[2,1,11],[1,3,20],[3,4,100],[3,4,200],[3,4,200],[4,3,499]]}}",
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                "insert into Calls (from_id, to_id, duration) values ('1', '2', '59')",
                "insert into Calls (from_id, to_id, duration) values ('2', '1', '11')",
                "insert into Calls (from_id, to_id, duration) values ('1', '3', '20')",
                "insert into Calls (from_id, to_id, duration) values ('3', '4', '100')",
                "insert into Calls (from_id, to_id, duration) values ('3', '4', '200')",
                "insert into Calls (from_id, to_id, duration) values ('3', '4', '200')",
                "insert into Calls (from_id, to_id, duration) values ('4', '3', '499')"
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