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            "No (treated or control) units for group 11 in time period 1; setting ATT to NA.",
            "No (treated or control) units for group 11 in time period 2; setting ATT to NA.",
            "No (treated or control) units for group 11 in time period 3; setting ATT to NA.",
            "No (treated or control) units for group 11 in time period 4; setting ATT to NA.",
            "No (treated or control) units for group 11 in time period 5; setting ATT to NA.",
            "No (treated or control) units for group 11 in time period 6; setting ATT to NA.",
            "No (treated or control) units for group 11 in time period 7; 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.",
            "No (treated or control) units for group 8 in time period 5; setting ATT to NA.",
            "No (treated or control) units for group 9 in time period 1; setting ATT to NA.",
            "No (treated or control) units for group 9 in time period 2; setting ATT to NA.",
            "No (treated or control) units for group 9 in time period 3; setting ATT to NA.",
            "No (treated or control) units for group 9 in time period 4; setting ATT to NA.",
            "No (treated or control) units for group 9 in time period 5; setting ATT to NA.",
            "No (treated or control) units for group 9 in time period 6; setting ATT to NA.",
            "No (treated or control) units for group 9 in time period 7; setting ATT to NA."
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