a-a a-b a-t aaa aab aak aao aar aas aat ab- aba abb abk abo abr abs abt aka akb akk ako akr aks aoa aob aok aoo aor aos aot ar- ara arb ark aro arr ars art as- asa asb ask aso asr ass ast at- ata atb ato atr ats att baa bab bak bao bar bas bat bba bbb bbk bbo bbr bbs bbt bka bkb bkk bko bkr bks bkt boa bob bok boo bor bos bot bra brb brk bro brr brs brt bsa bsb bsk bso bsr bss bst bta btb btk bto btr bts btt k-t ka- kaa kab kak kao kar kas kat kba kbb kbk kbo kbr kbs kkb kkk kkr kks kkt koa kob kok koo kor kos kot kra krk kro krr krs krt ksa ksb ksk kso ksr kss kst kta ktb ktk kto ktr kts ktt oaa oab oak oao oar oas oat ob- oba obb obk obo obr obs obt oka okb okk oko okr oks oo- ooa oob ook ooo oor oos oot or- ora orb ork oro orr ors ort os- osa osb osk oso osr oss ost ot- ota otb otk oto otr ots ott ra- raa rab rak rao rar ras rat rba rbb rbk rbo rbr rbs rbt rkb rkk rko rks rkt roa rob rok roo ror ros rot rra rrb rrk rrr rrs rrt rsa rsb rsk rso rsr rss rst rta rtb rtk rto rtr rts rtt saa sab sak sao sar sas sat sba sbb sbk sbo sbr sbs sbt sk- ska skb skk sko skr sks skt soa sob sok soo sor sos sot sr- sra srb srk sro srr srs srt ss- ssa ssb ssk sso ssr sss sst sta stb stk sto str sts stt taa tab tak tao tar tas tat tba tbb tbk tbo tbr tbs tbt tka tkb tkk tko tkr tks tkt to- toa tob tok too tor tos tot tra trb trk tro trr trs trt tsa tsb tsk tso tsr tss tst tta ttb ttk tto ttr tts ttt

a-ak a-ok aaaa aaab aaar aaas aaba aabb aabt aaka aaoo aara aaro aars aart aasa aass aast aata aatk aatt abaa abab abak abar abas abat abb- abba abbb abbo abbr abbs abbt aboa abob abok aboo abor abos abot abra abro abrs abs- absa abss abta abts akaa akao akar akas akka akko akok akos akot akr- akra aksa akst aoba aoks aora aorb aors aort aoss arab arak arar aras arat arba arbs arka arko arks aroa arob aroo aror aros arr- arra arrk arro arrr arrs arrt ars- arsa arsk arso arst arta arto artr arts asaa asab asak asao asar asas asat asba asbo aska asko askr asks askt asob asok asor asos asot asra asro asrs assa assk asso assr asss asst asta astb asto astr asts at-t ataa atab atak atar atas atat atbs atka atkt atob atok ator atos atot atra atrk atro atsb atst atta atto attr atts baaa baak baar baas baat baba babb babo babr babs bak- baka bako bakr baks bakt baos bar- bara barb bark baro barr bars bart basa bask baso bass bast bata bato bats batt bbas bbbb bbbs boab boak boar boas boat boba bobb bobo bobs boka boko boks boob book boor boos boot bor- bora bork boro borr bors bort bosa bosk boso boss bost bota botb boto bots bott brab brak brao bras brat brka brkb broa brob brok broo bror bros brot brrr brrs brsb brsr brst bsaa bsas bsat bskt bsos bsra bsts btaa btob btor btrt btss bttb k-os kaaa kaab kaak kaar kaas kaat kaba kabb kabo kabr kaka kakk kako kaks kakt kaoa kaok kaor kaos kara karb kark karo karr kars kart kas- kasa kasb kask kaso kasr kass kast kat- kata katb katk kato katr kats katt kbaa kbab kbak kbar kbas kbat kbba kbbb kbbk kbbo kbbr kbbs kbbt kbkb kbkk kbko kbkr kboa kbob kbok kboo kbos kbot kbra kbrb kbrk kbro kbrt kbsa kbsb kbsk kbso kbsr kbss kbst kbta kbtb kbtk kbto kbtr kbts kbtt kkaa kkar kkat kkba kkbb kkbo kkbr kkbs kkbt kkkk kkoa kkob kkoo kkor kkot kkrb kkrk kkro kkrr kkrs kkrt kksa kksr kkss kkst kktk kkts koab koak koar koas koba kobb kobk kobo kobr kobs koka kokb kokk koko kokr koks koob kook kooo koor koos koot kora korb kork koro korr kors kort kos- kosa kosb koso kosr koss kost kota kotb kotk koto kotr kots kott krab krak krar kras krat krba krbb krbk krbr krbt krka krkk krko krkr krks kroa krob krok kroo kror kros krrb krrk krro krrr krrs krrt krsa krsk krsr krss krst krta krtk krto krtr krts ksab ksak ksar ksas ksat ksba ksbr ksbs kska kskb kskk ksko kskr ksks ksob ksok ksoo ksor ksos ksra ksrb ksro ksrr ksrs ksrt kssa ksso kssr ksss ksst ksta kstb kstk ksto kstr ksts kstt ktaa ktak ktao ktar ktas ktat ktba ktbb ktbr ktbt ktkb ktkk ktko ktkr ktks ktkt ktob ktok ktoo ktor ktot ktrb ktrk ktro ktrr ktrs ktrt ktsa ktso ktsr ktst kttk ktto kttr ktts kttt oaks oara oars oass oast oats obak obas obba obbo obkb obok obor obos obot obra obro obsr obss obst obts okak okas okka okko okok okor okot okra okro oksa okso okta okto ooaa ooak ooba oooo ooos oora oort oosa oost ootb oots orab orak orao orar oras orat orba orbb orbo orbs orka orko oro- orok oror oros orot orra orro orrs orsa orsk orso orta orto orts osak osar osas osat osba osoo osor osos osro ossa ossb osso osta ostr osts otak otar otas otbs oto- otok otoo otor otos otra otro otrs otsa otso otta otto otts raab raak raas raat raba rabb rabk rabo rabs raka rakk rakt raob raok raos rara rarb rark raro rars