A syllable can have a beginning consonant and a semivowel in front of a necessary vowel, and can end in a consonant that is not a semivowel ([CS]V[CnotS]).
(C)(V)(C), (V), (V)(C), (C)(V)
In the case of two consonants in a row in a compound word, the former is dropped and the latter is, if possible, lenited.