public KSubset range(final int[] start, final int[] end) {
		final var s = new Subset(start.clone());
		final var e = new Subset(end.clone());

		if (this.start.compareTo(s) > 0 || this.end.compareTo(s) < 0) {
			throw new IllegalArgumentException("Invalid start value: " + s);
		}


		return null;
	}
Return the last element according its <em>natural</em> order.
<p>
<b>Last element of KSubset[n=20, k=8]</b>
<pre>
[12, 13, 14, 15, 16, 17, 18, 19]
</pre>

@return the last element of the k-subset
jenetics.incubator/src/main/java/io/jenetics/incubator/combinatorial/KSubset.java