question: return the unique instance of this class . concode_field_sep LocationPersitence INSTANCE concode_elem_sep Map<Character,LocationType> locationTypes concode_field_sep List<Location> loadLocations concode_elem_sep Location load concode_elem_sep void registerLocationType concode_elem_sep void saveLocations concode_elem_sep void save concode_elem_sep Location byUniqueIdentifier concode_elem_sep String getUniqueIdentifier
target: LocationPersitence function ( ) { return INSTANCE ; }