a-ak a-ok aaaa aaab aaac aaas aaba aabb aabc aaca aacb aacc aack aaco aacs aaka aaoo aasa aasc aass abaa abab abac abak abas abb- abba abbb abbo abbs abca abcb abcc abcs aboa abob abok aboo abos abs- absa abss abza acaa acab acac acas acba acca accc acco accs acks acoa acos acsa acsc acss akaa akao akas akca akka akko akok akos aksa aoba aoca aocs aoks aoss asaa asab asac asak asao asas asba asbo asc- asca ascb ascc asco aska asko asks asob asoc asok asos assa assc assk asso asss aza- azab azas azaz azca azo- azoo azos azza azzo baaa baak baas baaz baba babb babo babs bac- baca bacc back baco bacs bacz bak- baka bako baks baos basa basc bask baso bass baza bazo bbas bbbb bbbs bcaa bcas bcbc bcbs bcca bccc bccs bcos bcoz bcsa bcsc bcss boab boac boak boas boaz boba bobb bobo bobs boca bock boco bocs boka boko boks boob booc book boos booz bosa bosc bosk boso boss boza bozo bsaa bsac bsas bscs bsos bssc bzzz c-bo caaa caab caac caas caba cabo cabs cac- caca cacc cack caco caka caos caoz casa casb casc cask caso cass caza cazo cbac cbbc cbbs cbca cbcc cbcs cbka cbko cbsa cbsc ccaa ccab ccac ccas ccba ccbc ccca cccb cccc cccs ccob ccoc ccsa ccss ckac ckbc ckck ckco ckcs ckoa ckob ckoc ckoo ckos cksa cksb ckso coak coas coba cobb cobo cobs coca cock coco cok- coka coko coob cook coos cosa cosc coso coss cozz csaa csab csac csak csao csas cscb cscc csco cscs cska csks csob csos cssa k-os kaaa kaab kaak kaas kaba kabb kabc kabo kabz kacb kacc kaco kacs kacz kaka kakc kakk kako kaks kaoa kaoc kaok kaos kas- kasa kasb kasc kask kaso kass kaza kazc kazo kazz kbaa kbab kbac kbak kbas kbaz kbba kbbb kbbc kbbk kbbo kbbs kbbz kbca kbcb kbck kbco kbcs kbcz kbkb kbkk kbko kbkz kboa kbob kboc kbok kboo kbos kboz kbsa kbsb kbsk kbso kbss kbsz kbzc kbzo kbzs kbzz kcaa kcab kcac kcas kcba kcbc kcbk kcbs kcca kccb kccc kcck kckc kckk kcko kckz kcob kcos kcoz kcsa kcsb kcsc kcss kczo kczz kkaa kkac kkba kkbb kkbo kkbs kkbz kkcb kkck kkco kkcs kkkk kkoa kkob kkoo kkoz kksa kkss kkzz koab koac koak koas koaz koba kobb kobc kobk kobo kobs koca kocb kock kocs koka kokb kokc kokk koko koks kokz koob kooc kook kooo koos kooz kos- kosa kosb kosc koso koss kosz koza kozb kozk kozo ksab ksac ksak ksas ksaz ksba ksbc ksbs ksbz ksca kscb ksck ksco kscs kska kskb kskk ksko ksks kskz ksob ksoc ksok ksoo ksos kssa ksso ksss kssz kzaz kzbb kzbk kzbs kzbz kzks kzkz kzoo kzoz kzsb kzsc kzza kzzb kzzk kzzo kzzs kzzz oaks oasc oass obak obas obba obbo obkb obok obos obss ocab ocac ocak ocas ocbc occa occc ocks ocos ocsa okak okas okaz okka okko okok oksa okso ooaa ooak ooba oooo ooos oosa osak osas osba osca oscc osco osoo osos ossa ossb osso s-os sa-c saab saac saak saas saaz saba sabb sabc sabo sabs sabz saca sacc sack saco sacs saka sakb sakk sako saks saos sasa sasc sask saso sass saza sbaa sbac sbas sbbs sbca sbcc sbcs sbsa scaa scab scac scak scas scba sccc sccs sck- scob scok scoo scsa scsc scso skab skac skaz skss soak soas soaz soba sobo sobs soca sock soco socs soka sokk soko sook soos sosa soso soss soz- soza ssaa ssab ssac ssao ssas ssca sscc sscs ssoc sssa sssb sssc ssss szob szoc szss zaba zabo zaca zack zacs zaka zakk zaks zask zaza zobo zoco zoo- zook zoos zoso zoss zoza zozo zsss zzzs zzzz