private SortItem<T> getInmost() {
SortItem<T> res = null;
for (SortItem<T> o : list) {
if (o.getWithin().isEmpty() && nobodyWantsAround(o)) {
res = o;
break;
}
}
return res;
}
private void remove(SortItem<T> item) {
list.remove(item);
for (SortItem<T> o : list) {
o.getWithin().remove(item);
}
}