/**
* Function to add the instances of one set to the end of another.
*
* @param from The index of the first that is going to be copied.
* @param dest The dataset where the itemsets are going to be copied.
* @param num The number of itemsets to copy.
*/
private void copyItemsets(int from, MyDataset dest, int num) {
for (int i = 0; i < num; i++) dest.addItemset(itemset(from + i));
}
