public ClosableIterator<Long> getFifthIndex(Long first, Long second, Long third, Long fourth) {
return new EntryIteratorFourFixedOneArray(first, second, third, fourth, btree);
}
public ClosableIterator<Long> getFourthIndexOnly(Long first, Long second, Long third) {
return new EntryIteratorThreeFixedOneArray(first, second, third, btree);
}