Transliteration and interpretation issues

[Koen G]

Dutch is similar when it comes to consonants. A famous example is "angstschreeuw" (scream of fear). Apparently less common words like "slechtstschrijvend" can get even more consonants. With the previous spelling rules, "koeieuier" was the word with the longest sequence of vowels. Since 1996 the most is six, "zaaiuien". 

It must be noted that diacritics are always used to break up sequences of more than two of the same vowel. Either with umlaut, "tweeën" or with "-" as in "zee-eend". So a transcription by someone who does not know the writing system may not result in four identical characters in sequence.