@Override
	public AddressRange getFirstRange() {
		RedBlackEntry<Address, Address> first = rbTree.getFirst();
		if (first != null) {
			return new AddressRangeImpl(first.getKey(), first.getValue());
		}
		return null;
	}
Returns a list of the AddressRanges in this set.
@return  a list of the AddressRanges in this set.
Ghidra/Framework/SoftwareModeling/src/main/java/ghidra/program/model/address/AddressSet.java