* @throws CapacityExceededException if all tuples of the given arity
* drawn from this.universe cannot be represented as an integer.
*/
void checkCapacity(int arity) {
if (StrictMath.pow(base,arity) > Integer.MAX_VALUE) {
throw new CapacityExceededException("Arity too large (" + arity + ") for a universe of size " + universe.size(), Ints.nCopies(arity, base));
}
}