Опять какая-то проблема...
public static HashSet createSet() {
return new HashSet<>(Set.of(1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20));
}
public static HashSet removeAllNumbersMoreThan10(HashSet set) {
return new HashSet<>(set.stream()
.filter(s -> s.intValue()