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              "Be aware that there are some small groups in your dataset.\n  Check groups: 4,7,13,14.",
              "No (treated or control) units for group 13 in time period 1; setting ATT to NA.",
              "No (treated or control) units for group 13 in time period 2; setting ATT to NA.",
              "No (treated or control) units for group 13 in time period 3; setting ATT to NA.",
              "No (treated or control) units for group 13 in time period 4; setting ATT to NA.",
              "No (treated or control) units for group 13 in time period 5; setting ATT to NA.",
              "No (treated or control) units for group 13 in time period 6; setting ATT to NA.",
              "No (treated or control) units for group 13 in time period 7; setting ATT to NA.",
              "No (treated or control) units for group 14 in time period 1; setting ATT to NA.",
              "No (treated or control) units for group 14 in time period 2; setting ATT to NA.",
              "No (treated or control) units for group 14 in time period 3; setting ATT to NA.",
              "No (treated or control) units for group 7 in time period 1; setting ATT to NA.",
              "No (treated or control) units for group 7 in time period 2; setting ATT to NA.",
              "No (treated or control) units for group 7 in time period 3; setting ATT to NA."
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          {
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              "Be aware that there are some small groups in your dataset.\n  Check groups: 5,8,14,15.",
              "No (treated or control) units for group 12 in time period 1; setting ATT to NA.",
              "No (treated or control) units for group 14 in time period 1; setting ATT to NA.",
              "No (treated or control) units for group 14 in time period 2; setting ATT to NA.",
              "No (treated or control) units for group 14 in time period 3; setting ATT to NA.",
              "No (treated or control) units for group 14 in time period 4; setting ATT to NA.",
              "No (treated or control) units for group 14 in time period 5; setting ATT to NA.",
              "No (treated or control) units for group 15 in time period 1; setting ATT to NA.",
              "No (treated or control) units for group 8 in time period 1; setting ATT to NA.",
              "No (treated or control) units for group 8 in time period 2; setting ATT to NA.",
              "No (treated or control) units for group 8 in time period 3; setting ATT to NA.",
              "No (treated or control) units for group 8 in time period 4; setting ATT to NA."
            ],
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          {
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