bbbb bbdd bbrg bd-r bdii bfgf bibb bibi bidi bidr biff bifi bigb bigd bigg birb bird birg biri birr brid brig brrr dddd dfrf dfri dibb didi dif- diff digg digi diii dird dirr drib drif ffff ffii ffrr fidf fiff fifi figg fiii frib frid frig gddb gdfr ggfg gggg gibb gidd gidi giff gigg gigi gird girg giri girr grbr grib grid grif grig grrr ibfi ibid ibrd ibri idgf idid idig idir idrf ifbb ifid ifrb ifrf ifri igri iiii iri- irid irig irri rbbb rbbr rfdi rfid rgbi rib- ridd ridi riff rigg rigi riif riri rrif rrrr