Morphology
Number marking provides an example of implicational hierarchies in morphology.
(5) Number: singular < plural < dual < trial / paucal
On the one hand, the hierarchy implies that no language distinguishes a trial unless having a dual, and no language has dual without a plural. On the other hand, the hierarchy provides implications for the morphological marking: if the plural is coded with a certain number of morphemes, then the dual is coded with at least as many morphemes.
Read more about this topic: Implicational Hierarchy
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