a-ak a-ok aaaa aaab aaac aaaf aaap aaar aaba aabb aabc aabp aaca aacb aacc aacf aack aaco aacp aacr aafa aafb aafc aaff aaka aaoo aapa aapc aapo aara aarc aaro aarp abaa abab abac abaf abak abap abar abb- abba abbb abbo abbr abca abcb abcc abcf abcp abcr abff aboa abob abof abok aboo abor abpa abpc abpp abpr abra abrc abro acaa acab acac acap acar acba acca accc accf acco accp acfc acoa acop acor acpa acpr acr- acra acrc acro acrr afaa afak afao afap afar afca afcb afcc affa affc affo afka afkr afoa afoo afor afpa afpc afr- afra afrc afro akaa akao akap akar akca akka akko akok akpo akr- akra aoba aoca aokp aopo aora aorb apac apak apao apap apar apba apbr apca apcb apcc apco apcr apfa apfc apfo apo- apoc apof apoo apop apor appa appc appr apra aprc apro arab arac araf arak arap arar arba arc- arca arco arfa arfb arfc arff arka arko aroa arob aroo aror arpa arr- arra arrc arrk arro arrr baaa baaf baak baar baba babb babo babr bac- baca bacc back baco bafc baff bafo bak- baka bako bakr bapa bapc bapp bar- bara barb barc barf bark baro barr bbbb bbfc bbpr bbrc bcaa bcap bcar bcbc bcbp bcca bccc bcfc bcof bcor bcpp bcra bfca bfpo bfpp bkpr boab boac boak boar boba bobb bobo boca bock boco bofa boff boka boko boob booc boof book boop boor bopa bopp bor- bora borf bork boro borr bpcp bpfc bprc brab brac braf brak brao brca brcb brfc brka brkb broa brob broc brok broo bror brrr c-bo caaa caab caac caaf caap caba cabf cabo cac- caca cacc cack caco cacr cafa cafb cafc caff caka caor capa capb capc capo capp cara carb carc carf cark caro carp carr cbac cbar cbbc cbca cbcc cbcp cbcr cbfb cbfc cbka cbko cbkr cbpc cbpp ccaa ccab ccac ccaf ccap ccar ccba ccbc ccca cccb cccc cccf cccp ccfa ccfc ccff ccob ccoc ccpa ccpp ccpr ccra ccrc ccrf ccrp cfaa cfab cfac cfao cfar cfbc cfbr cfca cfcb cfcf cfco cffb cffr cfoa cfor cfpa cfpo cfpr cfra cfrb cfrp ckac ckbc ckck ckco ckfr ckoa ckob ckoc ckoo ckor ckpc ckpr ckrc coak coba cobb cobo coca cock coco cocp cofc coff cok- coka coko coob coof cook coop copa copo copp copr cor- cora corb corc corf cork coro corp corr cpaa cpac cpaf cpap cpbc cpca cpff cppa crab crac craf crap crar crbc crca crcc crcr crfc crkc crkp crob croc crok croo crop cror crpc f--k faaa faac faap faba fabo faca facc fack facp fafa fafc faff fafo fako fapa fapp fara farb farc fark faro farp farr fbar fbop fcab fcap fcar fcba fcca fccf fccp fcpa fcra ffar ffcc ffff ffrr fkab fkbp foaf foak foar foba foca fock foco fofo foof fook fopp for- fora forb fork foro forr fp-c fpaa fpcc fpra fprf frab frac frak frap frbc frcc frcp frfc frob frop kaaa kaab kaaf kaak kaap kaar kaba kabb kabc kabf kabo kabr kacb kacc kaco kacp kafa kafc kaff kafp kafr kaka kakc kakk kako kaoa kaoc kaok kaor kap- kapa kapc kapf kapo kapp kara karb karf kark karo karp karr kbaa kbab kbac kbak kbap kbar kbba kbbb kbbc kbbf kbbk kbbo kbbr kbca kbcb kbck kbco kbcr kbfb kbfc kbff kbfk kbfo kbfp kbfr kbkb kbkf kbkk kbko kbkr kboa kbob kboc kbok kboo kbpa kbpc kbpk kbpo kbpr kbra kbrb kbrc kbrf kbrk kbro kcaa kcab kcac kcap kcar kcba kcbc kcbf kcbk kcbr kcca kccb kccc kcck kccr kcfa kcfb kcfc kcfo kcfp kckc kckf kckk kcko kckr kcob kcof kcor kcpa kcpc kcpo kcpr kcrc kcro kcrp kcrr kfab kfac kfar kfbc kfbk kfcf kfco kfcr kffa kffb kfff kffk kfka kfkb kfok kfoo kfor kfpr kfra kfrc kfro kfrp kfrr kkaa kkac kkap kkar kkba kkbb kkbo kkbr kkcb kkck kkco kkcr kkfr kkkk kkoa kkob kkoo kkor kkpc kkpk kkrb kkrc kkrf kkrk kkro kkrr koab koac koak koap koar koba kobb kobc kobk kobo kobr koca kocb kocf kock kocp kofa kofc koff kofk kofo kofp koka kokb kokc kokf kokk koko kokp kokr koob kooc kook kooo koop koor kopa kopb kopf kopp kopr kora korb korc korf kork koro korr kpac kpak kpao kpar kpba kpbb kpbr kpcc kpcr kpfa kpfc kpfk kpfr kpkk kpkr kpoa kpob kpoc kpof kpok kpoo kpop kppc kppk kppo kppp kppr kprb kprc kprf kprk kpro kprp kprr krab krac krak krap krar krba krbb krbk krbr krca krcb krcc krco krfc krff krfo krfp krka krkc krkk krko krkr kroa krob kroc krof krok kroo krop kror krpa krpr krrb krrc krrf krrk krro krrr oafc oafo oara obak obba obbo obkb obok obor obra obro ocab ocac ocak ocap ocbc occa occc ocfa ocfp ocpa ocpp ocra ocro ocrr ofcr off- offa offc offo offr ofor ofra okak okap okka okko okok okor okpo okra okro ooaa ooak ooba oocr ooff oooo oora opap opar opca opo- opor oppa oppo opra orab orac orak orao orar orba orbb orbo orca orco orff orka orko oro- orof orok oror orpc orra orro paak paap paar paba paca pack paco pafa pafc paff paka pako paoc papa papb papp papr par- para parc parf park paro parp parr pbac pbar pbcc pboc pbpa pbpk pbrf pcaa pcaf pcap pcba pcbc pcca pccc pcfc pcoa pcpb pcpp pcra pcrc pcrf pfaa pfcb pfff pffr pfkp pfra poak poar poba pobo poca pock poco poff poka poko poof pook poop poor pop- popa popc popo popp pora porb porc pork poro porr ppac ppap ppar ppcc ppfa ppoa pppa pppo pppp pprc pprf prao prar prbc prca prcc prcf prcp prfc pro- proa prob proc prof proo prop raab raaf raak raba rabb rabk rabo rac- raca racc rack