A typically Gascon feature that may arise from this substrate is the change from "f" to "h". Where a word originally began with in Latin, such as "festa" 'party/feast', this sound was weakened to aspirated and then, in some areas, lost altogether; according to the substrate theory, this is due to the Basque dialects' lack of an equivalent phoneme, causing Gascon "hèsta" or . A similar change took place in Spanish. Thus, Latin "facere" gives Spanish "hacer" ((or, in some parts of southwestern Andalusia, ).