There are countries with open-list systems where the voters can cross out candidates (Iceland, Latvia, Monaco, Norway and Switzerland); countries with a cross-voting system, i.e. where the voters can mix candidates from lists of different parties (Liechtenstein, Luxembourg, Monaco and Switzerland). There are also countries where the candidates are nominated in single-member constituencies (nomination districts; Denmark, Romania); and countries using the single-transferable-vote system (Ireland and Malta).