The suffixes attach to a combination of noun plus case ending, so the stem that the suffix is attached to may not be the stem of the noun. Rather, a new "possessive stem" is formed from the noun with its case ending included. This stem is not always identical to the ending of the noun on its own; some case endings undergo modifications or the addition of a final vowel. Thus, certain cases may have possessive stems that inherently end in "-a", other cases may have "-i", but this is only significant if the combination has an even number of syllables.