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            {
              "group": 7,
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            {
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            {
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            {
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            {
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            {
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            {
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            {
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            {
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            "Be aware that there are some small groups in your dataset.\n  Check groups: 7.",
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            "No (treated or control) units for group 7 in time period 12; setting ATT to NA.",
            "No (treated or control) units for group 7 in time period 13; setting ATT to NA.",
            "No (treated or control) units for group 7 in time period 14; setting ATT to NA.",
            "No (treated or control) units for group 7 in time period 15; setting ATT to NA.",
            "No (treated or control) units for group 7 in time period 16; setting ATT to NA.",
            "No (treated or control) units for group 7 in time period 17; setting ATT to NA.",
            "No (treated or control) units for group 7 in time period 18; setting ATT to NA.",
            "No (treated or control) units for group 7 in time period 19; setting ATT to NA.",
            "No (treated or control) units for group 7 in time period 20; setting ATT to NA.",
            "No (treated or control) units for group 7 in time period 21; setting ATT to NA.",
            "No (treated or control) units for group 7 in time period 22; setting ATT to NA.",
            "No (treated or control) units for group 7 in time period 23; setting ATT to NA.",
            "No (treated or control) units for group 7 in time period 24; setting ATT to NA.",
            "No (treated or control) units for group 7 in time period 25; setting ATT to NA.",
            "No (treated or control) units for group 7 in time period 26; setting ATT to NA.",
            "No (treated or control) units for group 7 in time period 27; setting ATT to NA.",
            "No (treated or control) units for group 7 in time period 28; setting ATT to NA."
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