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Aug 16th, 2016
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  1. dt %>%
  2.  melt("ID", setdiff(colnames(dt), "ID")) %>%
  3.  group_by(ID) %>%
  4.  filter(value == max(value)) %>%
  5.  summarise(max_item = paste0(variable, collapse = ", ")) %>%
  6.  ungroup
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