private Address getAddressByPreExistingSymbolName(String name) {
		Address address = addressByPreExistingSymbolName.get(name);
		// Thin the list of map values we no longer need.  This method should only be
		// used after the list has been completely populated, and the NO_ADDRESS marker
		// was only being used during the method that populated the list to indicate that a
		// name was not unique for our needs.
		if (address != null && address.equals(Address.NO_ADDRESS)) {
			addressByPreExistingSymbolName.remove(name);
			return null;
		}
		return address;
	}
Returns the address for the symbol name.  If the symbol name did not exist within the
program when the list was being populated or if the name was seen at more than one address,
then null is returned
@param name the name of the symbol
@return the address for that name or null
Ghidra/Features/PDB/src/main/java/ghidra/app/util/pdb/pdbapplicator/PdbAddressManager.java