Sometimes, the given concept may not "feel" like a concept. E.g.,
Secondly Boys, or Thirdly Twice. For the purposes of Secondly|Thirdly|Fourthly,
anything that modifies the call is considered a concept. This includes identifiers
(e.g., Boys, Girls, Ends, Centers, Leaders, Trailers, Beaus, Belles, Heads, Sides);
formations (e.g., Triple Box); numerics (e.g., twice, 1 & 1/2, 2/3); and other
modifiers (e.g., Transfer And, Tally Ho But).
EN: 60