Background Considerations
A commonly held conception within phonology is that no morpheme is allowed to contain two consecutive high tones. If two consecutive high tones appear within a single morpheme, some rule must have applied (Odden 1986). Maybe one of the surface high-tone vowels was underlyingly high-toned, while the other was underlyingly toneless. Then, since all vowels must have tone at the surface (in this hypothetical language), the high tone of the one vowel spreads onto the other (see autosegmental phonology). Alternatively, one (or both) of the vowels may have started out low-toned and become high-toned due to the application of some rule; or perhaps there was a low tone between the two high tones that got deleted at some point. Regardless, the OCP claims that there can not have been two consecutive high tones (nor two consecutive low tones, etc.) in the underlying representation of the morpheme, i.e. in the morpheme's lexical entry.
Read more about this topic: Obligatory Contour Principle
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