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    Numbering rows within groups in a data frame
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    1. pbk1 13 May 2022
      df %>% group_by(cat) %>% mutate(id = row_number())

      numbering index within a group

      dplyr index by_group replicate count number
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    stackoverflow.com/questions/12925063/numbering-rows-within-groups-in-a-data-frame