487 word-finally (without a following -na) it seems to require something before it to summarize. On aka and uka, which already have a potential summarizing function, -ka occurs directly on the root, whether it is sentence-initial or -final. On other nouns the behavior of -ka is different. Sentence-initial nouns may take final -ka only if one or more deriva- tional suffixes (or zero complement vowel drop, which acts like a suffix) precede it on the stem; -ka does not occur directly on a plain noun root occurring sen- tence initially. On the other hand, sentence-final nouns are not so restricted. Such nouns may take the suffix -ka whether or not there are any derivational suffixes on the noun root. All of this suggests that when it occurs word- finally (with no other suffixes after it), -ka must have something before it longer than a single root. Thus, in order to take -ka a sentence-initial noun must have suffixes on it. A sentence-final noun need not have such suffixes, because when -ka occurs on a sentence- final noun, -ka summarizes not only the word it occurs on but all else that went before it in the sentence. Although this hypothesis needs further testing, it appears that -ka is probably best analyzed at present as a reduced (but already frozen) form of uka or aka. More study of its occurrences is needed to determine