at ▁‘ add i ▁' many ▁villages '. ▁ ▁The ▁convent ions ▁for ▁when ▁this ▁combination ▁of ▁singular ▁and ▁pl ural ▁is ▁or ▁is ▁not ▁possible ▁appear ▁to ▁be ▁complex . ▁ ▁As ▁in ▁Arab ic , ▁Tig re , ▁and ▁Ge ' ez , ▁n oun ▁pl ur als ▁are ▁formed ▁both ▁through ▁the ▁addition ▁of ▁suffix es ▁to ▁the ▁singular ▁form ▁(" external " ▁pl ural ) ▁and ▁through ▁the ▁modification ▁of ▁the ▁pattern ▁of ▁v ow els ▁within ▁( and ▁sometimes ▁outside ) ▁the ▁con son ants ▁that ▁make ▁up ▁the ▁n oun ▁root ▁(" internal " ▁or ▁" bro ken " ▁pl ural ). ▁In ▁some ▁cases ▁suffix es ▁may ▁also ▁be ▁added ▁to ▁an ▁internal ▁pl ural . ▁The ▁most ▁common ▁patterns ▁are ▁as ▁follows . ▁ ▁In ▁the ▁design ation ▁of ▁internal ▁pl ural ▁patterns , ▁" C " ▁represents ▁one ▁of ▁the ▁con son ants ▁of ▁the ▁n oun ▁root . ▁ ▁Note ▁that ▁some ▁n oun s ▁( for ▁example , ▁ <0xE1> <0x8B> <0x93> <0xE1> <0x88> <0xAB> <0xE1> <0x89> <0xB5> ▁‘ ar at ▁' bed ') ▁have ▁more ▁than ▁one ▁possible ▁pl ural . ▁External ▁pl ural ▁ ▁- at , ▁- tat ▁▁ <0xE1> <0x8B> <0x93> <0xE1> <0x88> <0xAB> <0xE1> <0x89> <0xB5> ▁‘ ar at ▁' bed ', ▁ <0xE1> <0x8B> <0x93> <0xE1> <0x88> <0xAB> <0xE1> <0x89> <0xB3> <0xE1> <0x89> <0xB5> ( <0xE1> <0x8B> <0x93> <0xE1> <0x88> <0xAB> <0xE1> <0x8B> <0x8D> <0xE1> <0x89> <0xB2> ) ▁‘ ar at at ▁' bed s ▁