aaaa aaab aaaf aaap aaar aaba aabb aabp aabt aafa aafb aaff aaoo aapa aapo aapt aara aaro aarp aart aata aatf aatt abaa abab abaf abap abar abat abb- abba abbb abbo abbr abbt abff aboa abob abof aboo abor abot abpa abpp abpr abra abro abta afaa afao afap afar afat affa affo afft afoa afoo afor afpa afr- afra afro afta aftp aoba aopo aora aorb aort aotf apao apap apar apat apba apbr apfa apfo apft apo- apof apoo apop apor apot appa appr appt apra apro aprt apta aptt arab araf arap arar arat arba arfa arfb arff arft aroa arob aroo aror arpa arr- arra arro arrr arrt arta arto artr at-t ataa atab atap atar atat atfb atob atof atop ator atot atpr atra atro atrp atta atto attp attr baaa baaf baar baat baba babb babo babr baff bafo baft bapa bapp bapt bar- bara barb barf baro barr bart bata batf bato batt bbbb bbpr bfpo bfpp bfta bftt boab boar boat boba bobb bobo bofa boff boob boof boop boor boot bopa bopp bor- bora borf boro borr bort bota botb boto bott bpot bptf brab braf brao brat broa brob broo bror brot brrr btaa btaf btbp btob btor btrt bttb faaa faap faba fabo fafa faff fafo fapa fapp fara farb faro farp farr fart fata fatf fato fatt fbar fbop ffar ffff ffrr fftf foaf foar foba fobt fofo foof foot fopp for- fora forb foro forr fort fota foto fotp fott fpaa fpra fprf frab frap frat frob frop frot frta ftop oafo oara obba obbo obor obot obra obro off- offa offo offr ofor ofra ofta oftp ooaa ooba ooff oooo oora oort ootb ootp opap opar opo- opor oppa oppo opra opto orab orao orar orat orba orbb orbo orff oro- orof oror orot orra orro orta orto otap otar otfp oto- otof otoo otor otpp otra otro otta otto paap paar paat paba pabt pafa paff papa papb papp papr par- para parf paro parp parr part pata pato patr patt pbar pbpa pbrf pfaa pfff pffr pfft pfra poar poat poba pobo poff poof poop poor poot pop- popa popo popp popt pora porb poro porr port pota potf poto pott ppap ppar ppfa ppoa pppa pppo pppp pprf ppta pptt prao prar prat pro- proa prob prof proo prop prot prtp prtr ptab ptaf ptop ptrf raab raaf raat raba rabb rabo rafa raff raft raob raop rapa rapp rapt rara rarb rarf raro rata ratf rato ratp ratt rbaf rbbb rbbr roab roaf roap roar roat rob- roba robb robo robt roff rofo roob roof roop roor root ropa ropo rora roro rort rota roto rotr rott rpob rpof rpta rrat rrrr rtbf rtfb rtpa rttp taa- taaf taar taat taba tabb tabo tafa taff tafo taft taoa taor tapa tapo tapp tapr tapt tara tarb tarf taro tarp tarr tart tata tatb tato tatr tatt tbaf tbar tbrb tbta tbtp tfot tfpt tftp toab toat toba tobo tobt tofa toff tofo toft tooa toof toor toot top- topa topf topo topp topt tora torf toro torp torr tort tota toto totr tott tpap tppa tppp tppr tptp tptr traa trab traf trao trap trat trfr troa troo trop trot trpa trpp trra trtr ttab ttbb ttfa ttff ttop tttt