static <A> S renderUniquenessRatio(Cl<A> entries) {
  if (empty(entries)) ret "no data";
  int total = l(entries), unique = countUniques(entries);
  ret "Uniqueness ratio: " + formatDouble(doubleRatio(total, unique), 1)
    + spaceRoundBracket(joinWithComma(
      n2(total, "total entry", "total entries"),
      n2(unique, "unique entry", "unique entries")));
}