a-a a-b a-c a-z aaa aab aac aak aao aar aas aaz ab- aba abb abc abk abo abr abs abz ac- aca acb acc ack aco acr acs acz aka akb akc akk ako akr aks aoa aob aoc aok aoo aor aos ar- ara arb arc ark aro arr ars arz as- asa asb asc ask aso asr ass asz az- aza azb azo azs azz baa bab bac bak bao bar bas baz bba bbb bbc bbk bbo bbr bbs bca bcb bcc bck bco bcr bcs bcz bka bkb bkc bkk bko bkr bks boa bob boc bok boo bor bos boz bra brb brk bro brr brs brz bsa bsb bsc bsk bso bsr bss bza bzo bzr bzs bzz c-- caa cab cac cak cao car cas caz cba cbb cbc cbk cbo cbr cbs cbz cca ccb ccc cck cco ccr ccs ccz cka ckb ckc cko cks co- coa cob coc cok coo cor cos coz cra crb crc crk cro crr crs crz csa csb csc csk cso csr css csz cz- czc czk czo k-z ka- kaa kab kac kak kao kar kas kaz kba kbb kbc kbk kbo kbr kbs kbz kca kcb kcc kck kcr kcs kkb kkc kkk kkr kks koa kob koc kok koo kor kos koz kra krc krk kro krr krs ksa ksb ksc ksk kso ksr kss kzo oaa oab oac oak oao oar oas ob- oba obb obc obk obo obr obs oc- oca ocb occ ock oco ocr ocs ocz oka okb okc okk oko okr oks oo- ooa oob ooc ook ooo oor oos or- ora orb orc ork oro orr ors orz os- osa osb osc osk oso osr oss oza ozo ozs ozz ra- raa rab rac rak rao rar ras raz rba rbb rbc rbk rbo rbr rbs rca rcb rcc rco rcr rcs rkb rkc rkk rko rks rkz roa rob roc rok roo ror ros roz rra rrb rrc rrk rrr rrs rsa rsb rsc rsk rso rsr rss rza rzb rzo saa sab sac sak sao sar sas saz sba sbb sbc sbk sbo sbr sbs sca scb scc sck sco scr scs sk- ska skb skc skk sko skr sks soa sob soc sok soo sor sos soz sr- sra srb src srk sro srr srs ss- ssa ssb ssc ssk sso ssr sss ssz sza szr zaa zab zac zak zao zar zas zaz zbb zbc zbr zbs zco zcs zka zks zo- zoa zob zoc zok zoo zor zos zro zrs zsa zsz zzr zzs zzz

a-ak a-ok aaaa aaab aaac aaar aaas aaba aabb aabc aaca aacb aacc aack aaco aacr aacs aaka aaoo aara aarc aaro aars aasa aasc aass abaa abab abac abak abar abas abb- abba abbb abbo abbr abbs abca abcb abcc abcr abcs aboa abob abok aboo abor abos abra abrc abro abrs abs- absa abss abza acaa acab acac acar acas acba acca accc acco accs acks acoa acor acos acr- acra acrc acro acrr acrs acsa acsc acss akaa akao akar akas akca akka akko akok akos akr- akra aksa aoba aoca aocs aoks aora aorb aors aoss arab arac arak arar aras arba arbs arc- arca arco arcs arka arko arks aroa arob aroo aror aros aroz arr- arra arrc arrk arro arrr arrs ars- arsa arsc arsk arso arza arzo asaa asab asac asak asao asar asas asba asbo asc- asca ascb ascc asco ascr aska asko askr asks asob asoc asok asor asos asra asrc asro asrs assa assc assk asso assr asss aza- azab azar azas azaz azca azo- azoo azor azos azra azza azzo baaa baak baar baas baaz baba babb babo babr babs bac- baca bacc back baco bacs bacz bak- baka bako bakr baks baos bar- bara barb barc bark baro barr bars barz basa basc bask baso bass baza bazo bbas bbbb bbbs bbrc bcaa bcar bcas bcbc bcbs bcca bccc bccs bcor bcos bcoz bcra bcrs bcsa bcsc bcss boab boac boak boar boas boaz boba bobb bobo bobs boca bock boco bocs boka boko boks boob booc book boor boos booz bor- bora bork boro borr bors borz bosa bosc bosk boso boss boza bozo brab brac brak brao bras braz brca brcb brka brkb broa brob broc brok broo bror bros broz brrr brrs brsb brsr brza bsaa bsac bsas bscs bsos bsra bssc bzrk bzzz c-bo caaa caab caac caas caba cabo cabs cac- caca cacc cack caco cacr caka caor caos caoz cara carb carc cark caro carr cars casa casb casc cask caso casr cass caza cazo cbac cbar cbbc cbbs cbca cbcc cbcr cbcs cbka cbko cbkr cbsa cbsc ccaa ccab ccac ccar ccas ccba ccbc ccca cccb cccc cccs ccob ccoc ccra ccrc ccrs ccsa ccss ckac ckbc ckck ckco ckcs ckoa ckob ckoc ckoo ckor ckos ckrc cksa cksb ckso coak coas coba cobb cobo cobs coca cock coco cok- coka coko coob cook coos cor- cora corb corc cork coro corr cors cosa cosc coso coss cozz crab crac crar cras crbc crca crcc crcr crcz crkc crob croc crok croo cror croz crsa crss csaa csab csac csak csao csar csas cscb cscc csco cscr cscs cska csks csob csor csos csra csrc csrs cssa cssr czar k-os kaaa kaab kaak kaar kaas kaba kabb kabc kabo kabr kabz kacb kacc kaco kacs kacz kaka kakc kakk kako kaks kaoa kaoc kaok kaor kaos kara karb kark karo karr kars karz kas- kasa kasb kasc kask kaso kasr kass kaza kazc kazo kazr kazz kbaa kbab kbac kbak kbar kbas kbaz kbba kbbb kbbc kbbk kbbo kbbr kbbs kbbz kbca kbcb kbck kbco kbcr kbcs kbcz kbkb kbkk kbko kbkr kbkz kboa kbob kboc kbok kboo kbos kboz kbra kbrb kbrc kbrk kbro kbrz kbsa kbsb kbsk kbso kbsr kbss kbsz kbzc kbzo kbzs kbzz kcaa kcab kcac kcar kcas kcba kcbc kcbk kcbr