a-ak a-do a-ok aaaa aaab aaad aaas aaba aabb aabd aada aads aaka aaoo aasa aasd aass abaa abab abad abak abas abb- abba abbb abbo abbs abda abdo aboa abob abod abok aboo abos abs- absa absd abss adaa adab adad adak adao adas adba adda addd addo adds adob adod adok adoo ados adsa adso adss akaa akao akas akka akko akok akos aksa aoba aoks aosd aoss asaa asab asad asak asao asas asba asbo asda asdo asds aska asko asks asob asod asok asos assa assd assk asso asss baaa baad baak baas baba babb babo babs bada badb badd bado bads bak- baka bako baks baos basa bask baso bass bbad bbas bbbb bbbs bbdd bbdo bdos bdsd boab boad boak boas boba bobb bobo bobs boda bodb bodo bods boka boko boks boob bood book boos bosa bosk boso boss bsaa bsas bsbd bsod bsos bssd d-bo daab daad daas daba dabb dabo dabs dada dado dads daka dako daks daos dasa dasb dasd dask dass dbas dbos dbsa dbss dddd ddss dkba doab doak doas doba dobb dobs dod- doda dodd dodo dods doka doko doob dood dook doos dosa dosk doso doss dsba dsda dsoa dsos dssa k-os kaaa kaab kaak kaas kaba kabb kabd kabo kad- kada kadd kado kads kaka kakk kako kaks kaoa kaok kaos kas- kasa kasb kask kaso kass kbaa kbab kbad kbak kbas kbba kbbb kbbd kbbk kbbo kbbs kbdb kbdo kbds kbkb kbkk kbko kboa kbob kbod kbok kboo kbos kbsa kbsb kbsk kbso kbss kdaa kdab kdad kdak kdao kdbb kdbs kddb kddd kddk kdka kdkb kdkd kdkk kdko kdok kdsd kdsk kdss kkaa kkba kkbb kkbd kkbo kkbs kkda kkdd kkdo kkkk kkoa kkob kkoo kksa kksd kkss koab koak koas koba kobb kobk kobo kobs koda kodk kodo kods koka kokb kokk koko koks koob kook kooo koos kos- kosa kosb kosd koso koss ksab ksak ksas ksba ksbs ksdk ksds kska kskb kskd kskk ksko ksks ksob ksok ksoo ksos kssa ksso ksss oaks oass obad obak obas obba obbo obkb obok obos obsd obss odas odbo odda oddd odds odoo odos odso okak okas okka okko okok oksa okso ooaa ooak ooba ooda oooo ooos oosa osak osas osba osoo osos ossa ossb ossd osso s-os saab saad saak saas saba sabb sabo sabs sada sadb sadd sado sads saka sakb sakk sako saks saos sasa sasd sask saso sass sbaa sbas sbbs sbds sbsa sbsd sdak sdba sdds sdss skab skad sksd skss soad soak soas soba sobo sobs soda sodd sodo sods soka sokk soko sood sook soos sosa soso soss ssaa ssab ssao ssas ssdd sssa sssb ssss