sbool containsIgnoreCase(Collection<S> l, S s) {
  if (l != null) for (S x : l)
    if (eqic(x, s))
      ret true;
  ret false;
}

static boolean containsIgnoreCase(S[] l, S s) {
  if (l != null) for (S x : l)
    if (eqic(x, s))
      ret true;
  ret false;
}

static boolean containsIgnoreCase(S s, char c) {
  ret indexOfIgnoreCase(s, String.valueOf(c)) >= 0;
}

static boolean containsIgnoreCase(S a, S b) {
  ret indexOfIgnoreCase(a, b) >= 0;
}