▁, ▁, ▁, ▁, ▁, ▁, ▁and ▁. ▁The ▁upper case ▁, ▁, ▁, ▁, ▁and ▁ ▁are ▁also ▁pres cribed ▁by ▁the ▁R AE , ▁although ▁occasionally ▁disp ensed ▁with ▁in ▁practice . ▁ ▁As ▁implemented ▁on ▁the ▁mechanical ▁type writer , ▁the ▁keyboard ▁contained ▁a ▁single ▁dead ▁key , ▁with ▁the ▁ac ute ▁acc ent ▁ ▁in ▁the ▁lower case ▁position , ▁and ▁the ▁dia er esis ▁ ▁in ▁the ▁upper case ▁position . ▁With ▁these , ▁one ▁could ▁write ▁, ▁, ▁, ▁, ▁, ▁and ▁. ▁A ▁separate ▁key ▁provided ▁. ▁( A ▁dead ▁key ▁" ~ " ▁is ▁used ▁on ▁the ▁Spanish ▁and ▁Portuguese ▁key boards , ▁but ▁on ▁the ▁Latin ▁American ▁keyboard ▁the ▁" ~ " ▁is ▁not ▁a ▁dead ▁key ). ▁The ▁invert ed ▁marks ▁ ▁and ▁ ▁completed ▁the ▁required ▁minimum . ▁When ▁an ▁additional ▁key ▁was ▁added ▁to ▁electro - me chan ical ▁type writ ers , ▁this ▁was ▁used ▁for ▁ ▁and ▁, ▁though ▁these ▁are ▁not ▁required . ▁( They ▁are ▁somewhat ▁arch a ic ▁ord inal ▁abbre vi ations : ▁ ▁for ▁prim ero , ▁ ▁for ▁segunda , ▁etc .) ▁ ▁As ▁implemented ▁in ▁the ▁MS - D OS ▁operating ▁system ▁and ▁its ▁successor ▁Microsoft ▁Windows , ▁a ▁/ ▁pair — not ▁required ▁in ▁Spanish ▁but ▁needed ▁for ▁Catal an , ▁Portuguese , ▁and ▁French — is ▁typically ▁added , ▁and ▁the ▁use ▁of ▁the ▁ac ute ▁acc ent ▁and ▁dia er esis ▁with ▁capital ▁letters ▁( , ▁, ▁, ▁,