7. Much of the historical phonology of Unaaliq is reflected in the morphologic interchanges of sounds as they are brought together in the suffixation process. However, it is impossible for a living phonologic interchange to preserve intact the response to past phonetic conditions. In fact, there are some contradictions in the phonological rules showing that they go back to different time periods. For example, t coming into contact with k gives either tk or sk or nk depending on what kind of elements are involved. We may infer that the change to sk, being most drastic, is the most archaic. But at last analysis we cannot expect all problems to be solved in this manner, and have to base our reconstruction on the comparative data of the various dialects. This approach also has the advantage that it implies a definite time depth. What Unaaliq has in common only with Kuskokwim and Nunivak is recent; what it also has in common with Siberia goes back to the common Yupik period; what it has in common with Inupik goes back to the common Eskimo period. Disregarding then the morphologic interchanges of sound, except insofar as they are also confirmed by other evidence, we determine to the extent possible the phonetic structure of Yupik, Inupik and Proto Eskimo.
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