Costa, largely following Siebert, proposes that the following languages are assigned to SNEA: Massachusett, Narragansett, Mohegan-Pequot-Montauk (probably also including Western and Niantic), Quiripi-Naugatuck, Unquachog, and Loup A. Etchemin may also have been part of this group but the very small amount of material available precludes a more definitive conclusion. Costa outlines three sound changes that are innovations uniquely assignable to Proto-Eastern Algonquian, and hence constitute evidence for the subgrouping (the asterisk denotes a reconstructed sound in the proto-language: (a) palatalization of Proto-Eastern-Algonquian (PEA) *k; (b) merger of PEA consonant clusters "*hr" and "*hx;" (c) shift of word-final PEA "*r" to "š", all of which occur in Massachusett phonology.