 The usual solution to these issues is to create various nested subgroups.Western Romance is split into the Gallo-Iberian languages, in which lenition happens and which include nearly all the Western Romance languages, and the Pyrenean-Mozarabic group, which includes the remaining languages without lenition (and is unlikely to be a valid clade; probably at least two clades, one for Mozarabic and one for Pyrenean).Gallo-Iberian is split in turn into the Iberian languages (e.g.