structure(list(arm_num = integer(0), unique_event_name = character(0), 
    form = character(0)), row.names = integer(0), spec = structure(list(
    cols = list(arm_num = structure(list(), class = c("collector_integer", 
    "collector")), unique_event_name = structure(list(), class = c("collector_character", 
    "collector")), form = structure(list(), class = c("collector_character", 
    "collector"))), default = structure(list(), class = c("collector_guess", 
    "collector")), delim = ","), class = "col_spec"), class = c("spec_tbl_df", 
"tbl_df", "tbl", "data.frame"))
