-vac aaaa aaab aaac aaaf aaar aaav aaba aabb aabc aabt aaca aacb aacc aacf aaco aacr aact aacv aafa aafb aafc aaff aaoo aara aarc aaro aart aata aatc aatf aatt aava abaa abab abac abaf abar abat abb- abba abbb abbo abbr abbt abca abcb abcc abcf abcr abct abff aboa abob abof aboo abor abot abov abra abrc abro abta abva ac-t acaa acab acac acar acat acba acca accc accf acco acct acfc acft acoa acor acot acr- acra acrc acro acrr acrv acta actc actf acto actt actv acvv afaa afao afar afat afca afcb afcc affa affc affo afft afoa afoo afor afr- afra afrc afro afta aftc aoba aoca aora aorb aort aotc aotf arab arac araf arar arat arba arc- arca arco arct arfa arfb arfc arff arft aroa arob aroo aror arr- arra arrc arro arrr arrt arta artc arto artr artv arva arvo at-t ataa atab atac atar atat atca atcc atcf atco atcr atfb atfc atob atoc atof ator atot atra atrc atro atta atto attr avab avao avar avat avcc avco avor avot avra avro avva avvo baaa baaf baar baat baba babb babo babr bac- baca bacc baco bact bafc baff bafo baft bar- bara barb barc barf baro barr bart bata batc batf bato batt bava bbbb bbfc bbrc bcaa bcar bcat bcbc bcca bccc bcfc bcof bcor bcra bctc bcvo bfca bfta bftt boab boac boar boat boba bobb bobo boca boco bofa boff boob booc boof boor boot bor- bora borf boro borr bort bota botb boto bott bova bovo brab brac braf brao brat brav brca brcb brfc broa brob broc broo bror brot brrr brtc btaa btaf btcc btfc btob btor btrc btrt bttb c-bo caaa caab caac caaf caat caba cabf cabo cac- caca cacc caco cacr cafa cafb cafc caff caor cara carb carc carf caro carr cart cat- cata catb catc catf cato catt catv cava cavo cbac cbar cbat cbbc cbca cbcc cbcr cbct cbfb cbfc cbot cbrt cbta cbtc cbtf cbtv cbva cbvb cbvf cbvr ccaa ccab ccac ccaf ccar ccat ccba ccbc ccca cccb cccc cccf cccv ccfa ccfc ccff ccob ccoc ccra ccrc ccrf ccrt cctb cctc cctt cctv ccvo cfaa cfab cfac cfao cfar cfav cfbc cfbr cfbt cfbv cfca cfcb cfcf cfco cffb cffr cfoa cfor cfra cfrb cfrt cfta cftc cftr coat coba cobb cobo coca coco coct cofc coff coft coob coof coot cor- cora corb corc corf coro corr cort cota cotb cotc coto cott cova covo crab crac craf crar crat crbc crca crcc crcr crfc crob croc croo cror crot crrt crtc crtf crtv ctab ctba ctca ctcf ctfc ctfo ctor ctot ctrc ctta ctvo ctvt cvac cvar cvca cvcc cvfr cvra cvrr faaa faac faba fabo faca facc fact fafa fafc faff fafo fara farb farc faro farr fart fata fatc fatf fato fatt fava favc fbar fcab fcar fcat fcba fcca fccf fcot fcra fcto ffar ffcc ffff ffrr fftf foaf foar foba fobt foca foco fofo foof foot for- fora forb foro forr fort fota foto fott fr-v frab frac frat frbc frcc frfc frob frot frta frvt ft-c ftfc oafc oafo oara obba obbo obfv obor obot obra obro ocab ocac ocat ocbc occa occc occt ocfa ocra ocro ocrr oct- octa octo ofcr off- offa offc offo offr ofor ofra ofta ooaa ooba oocr ooff oooo oora oort ootb orab orac orao orar orat orav orba orbb orbo orca orco orff oro- orof oror orot orra orro orta ortc orto orvr otac otar otfc oto- otof otoo otor otov otra otro otta otto ovar ovo- ovoo ovot ovra raab raaf raat raba rabb rabo rac- raca racc raco ract racv rafa rafc raff raft raob raoc rara rarb rarf raro rata ratf rato ratt rava rbaf rbbb rbbr rcac rcaf rcbc rcbo rccb rccc rcfc rctc rctv rcvr rffc rftc roab roaf roar roat rob- roba robb robo robt roca rocc roco rofc roff rofo roob roof roor root rora rorc roro rort rota rotc roto rotr rott rova rovo rrat rrfc rrrr rtbf rtca rtcc rtfb rtfc rtva rv-c rvca taa- taaf taar taat taba tabb tabc tabo taca tacc taco tact tacv tafa tafc taff tafo taft taoa taor tara tarb tarc tarf taro tarr tart tata tatb tato tatr tatt tatv tava tavo tbaf tbar tbca tbcb tbcc tbrb tbta tcca tccc tcfc tcov tctc tfca tfot tftc toab toat toba tobo tobt toca toco tofa toff tofo toft tooa toof toor toot tora torc torf toro torr tort torv tota totc toto totr tott tova tovo traa trab trac traf trao trat trav trca trcc trfc trfr troa troc troo trot trra trtc trtr ttab ttbb ttfa ttfc ttff tttt tvac tvro tvrr tvtv vaar vaat vaca vaco vafa vara varf varr vart vata vato vatt vava vbcc vcat vfat vfcc vfor voar voat voca voff vofr vooc voor voot vor- vora voro vort vota voto vrac vrav vrba vroc vrot vrto vtac vvob vvvv