In Dutch we also need ü and ö for Dutch words like "reünie", "vacuüm", "coöperatie", "coördineren", "zoölogie" (ä only for loanwords like "salonfähig"), and ê for words like "enquête", "gêne", ç for words like "reçu", "façade", "Brabançonne" (the name of the national anthem in Belgium, where...