▁became ▁ ▁and ▁have ▁now ▁become ▁long ▁v ow els , ▁, ▁which ▁tends ▁to ▁create ▁new ▁ph on emes ▁with ▁a ▁relevant ▁opposition ▁between ▁short ▁v ow els ▁and ▁long ▁v ow els . ▁The ▁same ▁phenomen on ▁exists ▁in ▁one ▁part ▁of ▁Viv ar ais , ▁and ▁also ▁occurred ▁in ▁the ▁transition ▁from ▁Old ▁to ▁Middle ▁French . ▁ ▁In ▁an ▁un str essed ▁position , ▁some ▁v ow els ▁cannot ▁be ▁realized ▁and ▁become ▁more ▁closed ▁v ow els : ▁ ▁The ▁str essed ▁v owel ▁▁ ▁becomes ▁the ▁un str essed ▁v owel ▁ ▁. ▁For ▁instance ▁( str ess ▁under lined ): ▁c ò de ▁ ▁→ ▁cod ific ar ▁. ▁ ▁The ▁str essed ▁v owel ▁▁ ▁( un r ounded ) ▁becomes ▁the ▁un str essed ▁v owel ▁▁ ▁( r ounded ). ▁For ▁instance ▁( str ess ▁under lined ): ▁b ala ▁ ▁→ ▁bal on ▁. ▁ ▁The ▁str essed ▁di ph th ong ▁▁ ▁becomes ▁the ▁un str essed ▁di ph th ong ▁ ▁. ▁For ▁instance ▁( str ess ▁under lined ): ▁sa uta ▁ ▁→ ▁sa ut ar ▁. ▁ ▁The ▁str essed ▁di ph th ong ▁▁ ▁becomes ▁the ▁un str essed ▁di ph th ong ▁ ▁. ▁For ▁instance ▁( str ess ▁under lined ): ▁la issa ▁ ▁→ ▁la iss ar ▁. ▁▁ ▁Regional ▁variation ▁▁▁ ▁In ▁Lim ousin ▁and ▁Au ver gn at , ▁final ▁con son ants , ▁except ▁for ▁ ▁and ▁, ▁are ▁generally ▁m