a-ak aaaa aaab aaac aaap aaar aaba aabb aabc aabp aabt aaca aacb aacc aack aacp aacr aact aaka aapa aapc aapt aara aarc aarp aart aata aatc aatk aatt abaa abab abac abak abap abar abat abb- abba abbb abbr abbt abca abcb abcc abcp abcr abct abpa abpc abpp abpr abra abrc abta ac-t acaa acab acac acap acar acat acba acca accc accp acct acpa acpr acpt acr- acra acrc acrr acta actc actt akaa akap akar akca akka akr- akra apac apak apap apar apat apba apbr apca apcb apcc apcr appa appc appr appt apra aprc aprt apta aptc aptt arab arac arak arap arar arat arba arc- arca arct arka arpa arr- arra arrc arrk arrr arrt arta artc artr at-t ataa atab atac atak atap atar atat atca atcc atck atcr atka atkt atpr atra atrc atrk atrp atta attp attr baaa baak baar baat baba babb babr bac- baca bacc back bact bak- baka bakr bakt bapa bapc bapp bapt bar- bara barb barc bark barr bart bata batc batt bbbb bbpr bbrc bcaa bcap bcar bcat bcbc bcbp bcca bccc bcpp bcra bctc bkpr bkpt bpcp bprc brab brac brak brat brca brcb brka brkb brrr brtc btaa btbp btcc btrc btrt bttb caaa caab caac caap caat caba cac- caca cacc cack cacr caka capa capb capc capp capt cara carb carc cark carp carr cart cat- cata catb catc catt cbac cbar cbat cbbc cbca cbcc cbcp cbcr cbct cbka cbkr cbpc cbpp cbrt cbta cbtc ccaa ccab ccac ccap ccar ccat ccba ccbc ccca cccb cccc cccp ccpa ccpp ccpr ccra ccrc ccrp ccrt cctb cctc cctt ckac ckat ckbc ckck ckpc ckpr ckrc cktb cpaa cpac cpap cpbc cpca cppa cprt cptp cptr crab crac crap crar crat crbc crca crcc crcr crkc crkp crpc crrt crtc crtp ctab ctba ctca ctcp ctpp ctrc ctrp ctta kaaa kaab kaak kaap kaar kaat kaba kabb kabc kabr kacb kacc kacp kact kaka kakc kakk kakt kap- kapa kapc kapp kapt kara karb kark karp karr kart kat- kata katb katc katk katp katr katt kbaa kbab kbac kbak kbap kbar kbat kbba kbbb kbbc kbbk kbbr kbbt kbca kbcb kbck kbcr kbct kbkb kbkk kbkr kbpa kbpc kbpk kbpr kbpt kbra kbrb kbrc kbrk kbrt kbta kbtb kbtc kbtk kbtr kbtt kcaa kcab kcac kcap kcar kcat kcba kcbc kcbk kcbr kcca kccb kccc kcck kccr kcct kckc kckk kckr kcpa kcpc kcpr kcpt kcrc kcrp kcrr kcrt kcta kctb kctc kkaa kkac kkap kkar kkat kkba kkbb kkbr kkbt kkcb kkck kkcr kkct kkkk kkpc kkpk kkpt kkrb kkrc kkrk kkrr kkrt kktc kktk kpac kpak kpar kpat kpba kpbb kpbr kpcc kpcr kpkk kpkr kppc kppk kppp kppr kprb kprc kprk kprp kprr kprt kptr kptt krab krac krak krap krar krat krba krbb krbk krbr krbt krca krcb krcc krka krkc krkk krkr krpa krpr krpt krrb krrc krrk krrr krrt krta krtc krtk krtr ktaa ktak ktap ktar ktat ktba ktbb ktbc ktbr ktbt ktcc ktck ktcr ktkb ktkc ktkk ktkr ktkt ktpa ktpk ktpr ktpt ktrb ktrc ktrk ktrp ktrr ktrt kttc kttk kttp kttr kttt paak paap paar paat paba pabt paca pack pact paka papa papb papp papr par- para parc park parp parr part pata patr patt pbac pbar pbcc pbpa pbpk pcaa pcap pcba pcbc pcca pccc pcpb pcpp pcra pcrc ppac ppap ppar ppcc pppa pppp pprc ppta pptt prar prat prbc prca prcc prcp prtc prtp prtr ptab ptak ptca ptcc pttc pttk raab raak raat raba rabb rabk rac- raca racc rack ract raka rakk rakt rapa rapc rapp rapt rara rarb rark rata ratk ratp ratt rbbb rbbr rcac rcbc rccb rccc rcpt rctc rpca rpta rrat rrrr rtca rtcc rtpa rttp taa- taar taat taba tabb tabc taca tacc tack tact taka takk takt tapa tapp tapr tapt tara tarb tarc tark tarp tarr tart tata tatb tatr tatt tbar tbca tbcb tbcc tbrb tbta tbtp tcap tcca tccc tcpa tctc tkac tpac tpap tpck tpcp tppa tppp tppr tptp tptr traa trab trac trak trap trat trca trcc trpa trpc trpp trra trtc trtr ttab ttbb ttcp tttt