E.g. /knank stjajts smoms/ even they do follow the Sonority Sequencing Principle
There are several reasons conspiring to make palindromic syllables rare in natural languages
- Most languages have certain restrictions on the beginning and ending consonant clusters of syllables, and those restrictions are typically not symmetrical, i.e., in general a reversed syllable needn't be legal
- a diphthong at the syllable core cannot occur in a palindromic syllable
- there are also some consonants (e.g. affricates like /ts/ or /pf/) that cannot be reversed
- diachronic processes like dissimilation tend to get rid of double occurrences of the consonants /l, n, r/ in one syllable
Nevertheless, simple palindromic syllables occur and some frequent words (like English a, did) are examples of them.
No language has a significant tendency to exclude palindromic syllables: if plarg and gralp are possible syllables, plalp and grarg are as well.