, correct = TRUE, message = structure("Nice work! You can use select helpers like <code>starts_with()<\u002fcode> or <code>contains()<\u002fcode> when selecting columns", html = TRUE, class = c("html",     "character"))), class = c("tutorial_question_answer", "tutorial_quiz_answer")), structure(list(id = "lnr_ans_541de6f", option = "`penguins %>% \n  group_by(year) %>% \n  summarize_at(c(bill_length_mm, bill_depth_mm), sd, na.rm = TRUE)`",     value = "`penguins %>% \n  group_by(year) %>% \n  summarize_at(c