Why I cannot save mutate result in r

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I tried to rank "date" within each group (name) and also save the rank output as rank_date.

However, I kept receiving the error "Error in df %>% group_by(name) %>% rank_date <- mutate(df, rank = order(score, : could not find function "%>%<-""
Jun 9 in Data Analytics by Avinash
• 1,260 points
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