a-ii aaaa aaab aaaf aaai aaas aaba aabb aabi aafa aafb aaff aafi aaib aaii aais aaoo aasa aasf aasi aass abaa abab abaf abai abas abb- abba abbb abbi abbo abbs abff abia abib abis aboa abob abof aboo abos abs- absa absf absi abss afaa afao afbs affa affi affo affs afia afib afif afis afoa afoo afsa afsb aiai aias aiba aibo aiff aifs aiia aiib aioi aisa aisb aisi aiso aoba aoss asaa asab asaf asai asao asas asba asbo asfa asfi asia asif asii asio asis asob asof asoi asos assa assi asso asss ba-i baaa baaf baas baba babb babi babo babs baff bafo baia baib baio bais baos basa basf basi baso bass bbas bbbb bbbs bfas bffs bfsi biaf biao bias biba bibb bibi bibo bibs bifa biff bifi biis bio- bioi bios bis- bisa biso biss boab boai boas boba bobb bobi bobo bobs bofa boff bofs boi- boii bois boob boof boos bosa bosi boso boss bsaa bsas bsfa bsff bsfs bsos faaa faas faba fabi fabo fabs fafa faff fafi fafo faio fais fasa fasi faso fass fbis ffff ffii ffsa ffss fiaa fiaf fias fiba fibs fifa fiff fifi fifo fiii fios fisa fisi fiss foaf foba fobs fofo foia fois foof foos fosa fosb fosi foso foss fsai fsas fsfi fsfo fsia fssa fssf iaaa iaai iaas iaba iaff iaia iais iasa iasi iaso ibas ibfi ibia ibis ibos ibsa ibsf ibss ifaa ifao ifas ifbb ifis ifsa ifsb ifso iias iifa iiii iiio iiis iioi iioo iios iisi ioba iobi ioii ioio ioof iooi iooo ioos ioso is-a isaf isai isao isas isba isfa isia isis iso- isof isos issa issf issi isso isss oafo oafs oais oasi oass obai obas obba obbo obia obis oboi obos obss ofas off- offa offo offs oiba oiii oios ooaa ooba oobi ooff oofs ooia oooo ooos oosa oosi osaf osai osas osba osfa osia osii osis osoi osoo osos ossa ossb ossi osso s-ib s-ii s-os saab saaf saas saba sabb sabi sabo sabs safa safb saff safi safo saia saif sais saoi saos sasa sasf sasi saso sass sbaa sbai sbas sbbs sbia sbsa sbsi sfas sfba sfia sfio sfos sfss siaa siab siaf siai sias siba sibi sibo sibs sifa siff sifo sios sisa sisi siss soas soba sobo sobs sofa sofi sofo soia soif sois soof soos sosa sosi soso soss ssaa ssab ssao ssas ssis sssa sssb sssf sssi ssss