static void removeSetFromListQuickly(L l, Collection _set) {
Set set = asSet(_set);
if (l(set) < 10) {
ListIterator it = l.listIterator();
while (it.hasNext())
if (set.contains(it.next()))
it.remove();
} else {
L l2 = emptyListWithCapacity(l);
for (A a : l)
if (!set.contains(a))
l2.add(a);
copyList(l2, l);
}
}