@throws ClassCastException {@inheritDoc}
@throws NullPointerException if {@code fromElement} or {@code toElement}
is null and this set uses natural ordering, or its comparator
does not permit null elements
@throws IllegalArgumentException {@inheritDoc}
NavigableSet!(E)subSet(E fromElement, bool fromInclusive, E toElement, bool toInclusive)
@throws ClassCastException {@inheritDoc} @throws NullPointerException if {@code fromElement} or {@code toElement} is null and this set uses natural ordering, or its comparator does not permit null elements @throws IllegalArgumentException {@inheritDoc}