(bill_length_mm, bill_depth_mm), sd, na.rm = TRUE)`",     label = structure("<code>penguins %&gt;% \n  group_by(year) %&gt;% \n  summarize_at(c(bill_length_mm, bill_depth_mm), sd, na.rm = TRUE)<\u002fcode>", html = TRUE, class = c("html",     "character")), correct = FALSE, message = structure("Not quite. Remember that the columns selected in <code>summarize_at()<\u002fcode> must be wrapped inside <code>vars()<\u002fcode>", html = TRUE, class = c("html",     "character"))), class = c("tutorial_question_answ