1. exams.mylearn::special_characters
    List of Special Characters that Users Have to Deal with Manually
    csv| xlsx| json| ndjson| rda| rds
    data.frame|3 x 2
  2. stochvol::exrates
    Euro exchange rate data
    csv| xlsx| json| ndjson| rda| rds
    data.frame|3140 x 24