default A combine(final A other) {
		throw new UnsupportedOperationException(
			"No implementation for combining accumulators."
		);
	}
Combines {@code this} accumulator with the {@code other} one.

@param other the other accumulator
@return the combined accumulator
@throws UnsupportedOperationException unless it's overridden by the
        implementation
jenetics/src/main/java/io/jenetics/util/Accumulator.java