a-a a-b a-c aaa aab aac aad aak aao aas ab- aba abb abc abd abk abo abs ac- aca acb acc acd ack aco acs ad- ada adb adc add adk ado ads aka akb akc akd akk ako aks aoa aob aoc aod aok aoo aos as- asa asb asc asd ask aso ass baa bab bac bad bak bao bas bba bbb bbc bbd bbk bbo bbs bca bcb bcc bcd bck bco bcs bda bdb bdc bdd bdk bdo bds bka bkb bkc bkk bko bks boa bob boc bod bok boo bos bsa bsb bsc bsd bsk bso bss c-- caa cab cac cad cak cao cas cba cbb cbc cbd cbk cbo cbs cca ccb ccc ccd cck cco ccs cda cdb cdc cdd cdk cdo cds cka ckb ckc ckd cko cks co- coa cob coc cod cok coo cos csa csb csc csd csk cso css daa dab dac dad dak dao das dba dbb dbc dbd dbk dbo dbs dca dcb dcc dcd dck dco dcs dda ddb ddc ddd ddk ddo dds dka dkb dkc dkk dko dks doa dob doc dod dok doo dos dsa dsb dsc dsd dsk dso dss ka- kaa kab kac kad kak kao kas kba kbb kbc kbd kbk kbo kbs kca kcb kcc kcd kck kcs kda kdb kdc kdk kdo kds kkb kkc kkk kks koa kob koc kod kok koo kos ksa ksb ksc ksd ksk kso kss oaa oab oac oad oak oao oas ob- oba obb obc obd obk obo obs oc- oca ocb occ ocd ock oco ocs oda odb odc odd odo ods oka okb okc okd okk oko oks oo- ooa oob ooc ood ook ooo oos os- osa osb osc osd osk oso oss saa sab sac sad sak sao sas sba sbb sbc sbd sbk sbo sbs sca scb scc scd sck sco scs sda sdb sdc sdd sdk sdo sds sk- ska skb skc skd skk sko sks soa sob soc sod sok soo sos ss- ssa ssb ssc ssd ssk sso sss

a-ak a-do a-ok aaaa aaab aaac aaad aaas aaba aabb aabc aabd aaca aacb aacc aacd aack aaco aacs aada aadc aads aaka aaoo aasa aasc aasd aass abaa abab abac abad abak abas abb- abba abbb abbo abbs abca abcb abcc abcd abcs abda abdo aboa abob abod abok aboo abos abs- absa absd abss acaa acab acac acad acas acba acca accc accd acco accs acda acdb acdc acds ackd acks acoa acod acos acsa acsc acsd acss adaa adab adac adad adak adao adas adba adbc adcc adcs adda addc addd addo adds adob adoc adod adok adoo ados adsa adso adss akaa akao akas akca akka akko akok akos aksa aoba aoca aocs aoks aosd aoss asaa asab asac asad asak asao asas asba asbo asc- asca ascb ascc asco asda asdo asds aska asko asks asob asoc asod asok asos assa assc assd assk asso asss baaa baad baak baas baba babb babo babs bac- baca bacc back baco bacs bada badb badd bado bads bak- baka bako baks baos basa basc bask baso bass bbad bbas bbbb bbbs bbdd bbdo bcaa bcas bcbc bcbs bcca bccc bccs bcda bcds bcos bcsa bcsc bcss bdbc bddc bdos bdsd boab boac boad boak boas boba bobb bobo bobs boca bock boco bocs boda bodb bodo bods boka boko boks boob booc bood book boos bosa bosc bosk boso boss bsaa bsac bsas bsbd bscs bsod bsos bssc bssd c-bo c-cd caaa caab caac caas caba cabo cabs cac- caca cacc cack caco cada cadc cadd cado cads caka caod caos casa casb casc casd cask caso cass cbac cbbc cbbs cbca cbcc cbcs cbdb cbdc cbdo cbds cbka cbko cbsa cbsc ccaa ccab ccac ccad ccas ccba ccbc ccca cccb cccc cccs ccdc ccds ccob ccoc ccod ccsa ccsd ccss cdaa cdac cdad cdba cdcs cdda cddb cdos cdss ckac ckbc ckck ckco ckcs ckdo ckoa ckob ckoc ckoo ckos cksa cksb ckso coad coak coas coba cobb cobo cobs coca cock coco coda codd cods cok- coka coko coob cood cook coos cosa cosc coso coss csaa csab csac csak csao csas cscb cscc cscd csco cscs csda csdb cska csks csob csos cssa cssd d-bo daab daad daas daba dabb dabo dabs daca dacs dada dado dads daka dako daks daos dasa dasb dasc dasd dask dass dbas dbcc dbcs dbos dbsa dbss dcas dcbc dcca dccb dccc dccs dcdb dcds dcos dcsc dcss dddd ddoc ddss dkba dkdc doab doak doas doba dobb dobs doca dock doco docs dod- doda dodd dodo dods doka doko doob dood dook doos dosa dosk doso doss dsac dsba dsbc dscc dscs dsda dsoa dsos dssa dssc k-os kaaa kaab kaak kaas kaba kabb kabc kabd kabo kacb kacc kacd kaco kacs kad- kada kadd kado kads kaka kakc kakk kako kaks kaoa kaoc kaok kaos kas- kasa kasb kasc kask kaso kass kbaa kbab kbac kbad kbak kbas kbba kbbb kbbc kbbd kbbk kbbo kbbs kbca kbcb kbck kbco kbcs kbdb kbdo kbds kbkb kbkk kbko kboa kbob kboc kbod kbok kboo kbos kbsa kbsb kbsk kbso kbss kcaa kcab kcac kcad kcas kcba kcbc kcbd kcbk kcbs kcca kccb kccc kccd kcck kcda kcdc kcdd kcds kckc kckk kcko kcob kcos kcsa kcsb kcsc kcsd kcss kdaa kdab kdac kdad kdak kdao kdbb kdbs kdca kdcc kdcd kdco kddb kddc kddd kddk kdka kdkb kdkd kdkk kdko kdoc kdok kdsc kdsd kdsk kdss kkaa kkac kkba kkbb kkbd kkbo kkbs kkcb kkcd kkck kkco kkcs kkda kkdc kkdd kkdo kkkk kkoa kkob kkoo kksa kksd kkss koab koac koak koas koba kobb kobc kobk kobo kobs koca kocb kocd kock kocs koda kodk kodo kods koka kokb kokc kokk koko koks koob kooc kook kooo koos kos- kosa kosb kosc kosd koso koss ksab ksac ksak ksas ksba ksbc ksbs ksca kscb ksck ksco kscs