a-a a-b a-c a-t aaa aab aac aaf aao aar aat ab- aba abb abc abf abo abr abt ac- aca acb acc acf aco acr act af- afa afb afc aff afo afr aft aoa aob aoc aof aoo aor aot ar- ara arb arc arf aro arr art at- ata atb atc atf ato atr att baa bab bac baf bao bar bat bba bbb bbc bbf bbo bbr bbt bca bcb bcc bcf bco bcr bct bfa bfb bfc bff bfo bfr bft boa bob boc bof boo bor bot bra brb brf bro brr brt bta btb btc btf bto btr btt c-- caa cab cac caf cao car cat cba cbb cbc cbf cbo cbr cbt cca ccb ccc ccf cco ccr cct cfa cfb cfc cff cfo cfr cft co- coa cob coc cof coo cor cot cra crb crc crf cro crr crt cta ctb ctc ctf cto ctr ctt faa fab fac faf fao far fat fba fbb fbc fbf fbo fbr fbt fca fcb fcc fcf fco fcr fct ffa ffc fff ffo ffr fft foa fob foc fof foo for fot fra frb frc frf fro frr frt fta ftb ftc ftf fto ftr ftt oaa oab oac oaf oao oar oat ob- oba obb obc obf obo obr obt oc- oca ocb occ ocf oco ocr oct of- ofa ofb ofc off ofo ofr oft oo- ooa oob ooc oof ooo oor oot or- ora orb orc orf oro orr ort ot- ota otb otc otf oto otr ott ra- raa rab rac raf rao rar rat rba rbb rbc rbf rbo rbr rbt rca rcb rcc rcf rco rcr rct rfa rfb rfc rff rfo rfr rft roa rob roc rof roo ror rot rra rrb rrc rrf rrr rrt rta rtb rtc rtf rto rtr rtt taa tab tac taf tao tar tat tba tbb tbc tbf tbo tbr tbt tca tcb tcc tcf tco tcr tct tfa tfb tfc tff tfo tfr tft to- toa tob toc tof too tor tot tra trb trc trf tro trr trt tta ttb ttc ttf tto ttr ttt

aaaa aaab aaac aaaf aaar aaba aabb aabc aabt aaca aacb aacc aacf aaco aacr aact aafa aafb aafc aaff aaoo aara aarc aaro aart aata aatc aatf aatt 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 abra abrc abro abta ac-t acaa acab acac acar acat acba acca accc accf acco acct acfc acft acoa acor acot acr- acra acrc acro acrr acta actc actf acto actt 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 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 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 bbbb bbfc bbrc bcaa bcar bcat bcbc bcca bccc bcfc bcof bcor bcra bctc 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 brab brac braf brao brat 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 cbac cbar cbat cbbc cbca cbcc cbcr cbct cbfb cbfc cbot cbrt cbta cbtc cbtf ccaa ccab ccac ccaf ccar ccat ccba ccbc ccca cccb cccc cccf ccfa ccfc ccff ccob ccoc ccra ccrc ccrf ccrt cctb cctc cctt cfaa cfab cfac cfao cfar cfbc cfbr cfbt 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 crab crac craf crar crat crbc crca crcc crcr crfc crob croc croo cror crot crrt crtc crtf ctab ctba ctca ctcf ctfc ctfo ctor ctot ctrc ctta faaa faac faba fabo faca facc fact fafa fafc faff fafo fara farb farc faro farr fart fata fatc fatf fato fatt 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 frab frac frat frbc frcc frfc frob frot frta ft-c ftfc oafc oafo oara obba obbo 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 orba orbb orbo orca orco orff oro- orof oror orot orra orro orta ortc orto otac otar otfc oto- otof otoo otor otra otro otta otto raab raaf raat raba rabb rabo rac- raca racc raco ract rafa rafc raff raft raob raoc rara rarb rarf raro rata ratf rato ratt rbaf rbbb rbbr rcac rcaf rcbc rcbo rccb rccc rcfc rctc 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 rrat rrfc rrrr rtbf rtca rtcc rtfb rtfc taa- taaf taar taat taba tabb tabc tabo taca tacc taco tact tafa tafc taff tafo taft taoa taor