In the words of Georges Lacombe, because of the special features of this dialect, Euskera could well be divided into two groups of dialects: Biscayan and the rest. He argued that this dialect was so different from the rest, that the isoglosses separating it from the adjacent dialects (Gipuzkoan or central) are so close to each other that form a clear line; that is, the phonetic-phonological, morphosyntactic and lexical features of Biscayan coincide geographically to the point of creating a distinctively clear and defined dialectical border.