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Published online by Cambridge University Press: 20 October 2008
A basic assumption in current phonology is that features are not an unstructured set like (1a), but are arranged hierarchically into a constituent structure tree such as (1b), proposed in Sagey (1986: 61):

Other groupings of features have been proposed (Clements 1985; Steriade 1987; inter alii).
A fundamental assumption of theories like (1b) is that rules operate on constituents, an assumption which is formalised by limiting rules to spreading or delinking a single node.