@Override
	public CharSeq subSequence(final int start, final int end) {
		return new CharSeq(new String(array, start, end - start));
	}
Test whether this character set contains the given character {@code c}.

@param c the character to test.
@return {@code true} if this character set contains the given character,
         {@code false} otherwise.
jenetics/src/main/java/io/jenetics/util/CharSeq.java