ers ▁is ▁ 1 % - 5 %, ▁while ▁for ▁L 2 ▁speak ers ▁it ▁is ▁ 2 0 %. ▁In ▁terms ▁of ▁its ▁writing , ▁S ida ama ▁used ▁an ▁Eth iop ic ▁script ▁up ▁until ▁ 1 9 9 3 , ▁from ▁which ▁point ▁forward ▁it ▁has ▁used ▁a ▁Latin ▁script . ▁ ▁The ▁term ▁Sid amo ▁has ▁also ▁been ▁used ▁by ▁some ▁authors ▁to ▁refer ▁to ▁larger ▁group ings ▁of ▁East ▁C ush it ic ▁and ▁even ▁Om otic ▁languages . ▁The ▁languages ▁within ▁this ▁Sid amo ▁grouping ▁contain ▁similar , ▁altern ating ▁ph on ological ▁features . ▁The ▁results ▁from ▁a ▁research ▁study ▁conducted ▁in ▁ 1 9 6 8 - 1 9 6 9 ▁concerning ▁mut ual ▁intellig ibility ▁between ▁different ▁Sid amo ▁languages ▁suggest ▁that ▁S ida ama ▁is ▁more ▁closely ▁related ▁to ▁the ▁G ede o ▁language , ▁which ▁it ▁shares ▁a ▁border ▁with ▁to ▁the ▁south , ▁than ▁other ▁Sid amo ▁languages . ▁According ▁to ▁the ▁Eth n olog ue , ▁the ▁two ▁languages ▁share ▁a ▁lex ical ▁similarity ▁of ▁ 6 0 %. ▁S ida ama ▁voc ab ul ary ▁has ▁been ▁influenced ▁by ▁O rom o ▁voc ab ul ary . ▁ ▁Gram mar ▁ ▁N oun ▁P hr ases ▁ ▁In ▁S ida ama , ▁not ▁all ▁n oun ▁phr ases ▁have ▁n oun s . ▁This ▁can ▁occur ▁when ▁it ▁is ▁so ▁obvious ▁what ▁kind ▁of ▁thing ▁the ▁refer ent ▁of ▁the ▁n oun ▁phrase ▁is , ▁that ▁it ▁is ▁unnecessary