// unclear semantics when l is a special set (e.g. ciSet) static bool containsOneOf(Collection l, A... x) { if (l cast Set) { if (x != null) for (A a : x) if (l.contains(a)) true; } else { for (A a : unnull(l)) if (eqOneOf(a, x)) true; } false; } static bool containsOneOf(Collection l, Set set) { if (set == null) false; for (A a : unnull(l)) if (set.contains(a)) true; false; } static bool containsOneOf(S s, S... x) { for (S o : x) if (contains(s, o)) true; false; }