The most complex syllable in Tsou is CCVV. Tsou is unusual in the number of consonant clusters that it allows. Homorganic clusters are not allowed, unless one is a nasal consonant, and a maximum of two consonants may occur together, but otherwise about half of possible sequences are known to occur. For example, all non-homorganic sequences starting with /t/ and /ts/ are found. Missing clusters may not be allowed, or may simply be accidental gaps due to limited knowledge of the lexicon.