two_class_set
two_class_set %>% comment_get("none_cart")
new_set <-
two_class_set %>%
comment_add("none_cart", "What does 'cart' stand for\u2753") %>%
comment_add("none_cart", "Classification And Regression Trees.")
comment_print(new_set)
new_set %>% comment_get("none_cart")
new_set %>%
comment_reset("none_cart") %>%
comment_get("none_cart")
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