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  1. NOME ANO MES COLUNA_QUE_QUERO_CRIAR
  2. A 2016 4 1
  3. A 2016 4 2
  4. B 2016 5 1
  5. B 2016 5 2
  6. B 2016 5 3
  7.  
  8. dataset %>% group_by(NOME) %>% mutate('COLUNA_QUE_QUERO_CRIAR' = n())
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