public void fill() {
Iterator<BagConfiguration> itr = this.configuration.iterator();
int id = 0;
while (itr.hasNext()) {
BagConfiguration current = itr.next();
String name = current.getName();
int value = current.getValue();
int number = current.getNumber();
for (int i = 0; i < number; i++) {
this.addLetter(FACTORY.createLetter(name.charAt(0), value, id));
id++;
}