a-a a-b a-c a-t aaa aab aac aaf aak aao aar aat aay ab- aba abb abc abf abk abo abr abt aby ac- aca acb acc acf ack aco acr act acy af- afa afb afc aff afk afo afr aft afy aka akb akc akk ako akr aoa aob aoc aof aok aoo aor aot ar- ara arb arc arf ark aro arr art ary at- ata atb atc atf ato atr att ay- aya ayc ayf ayk ayo ayr ayt baa bab bac baf bak bao bar bat bay bba bbb bbc bbf bbk bbo bbr bbt bby bca bcb bcc bcf bck bco bcr bct bcy bfa bfb bfc bff bfo bfr bft bfy bka bkb bkc bkf bkk bko bkr bkt boa bob boc bof bok boo bor bot boy bra brb brf brk bro brr brt bry bta btb btc btf btk bto btr btt bty by- bya byc byf byk byo byr byt c-- caa cab cac caf cak cao car cat cay cba cbb cbc cbf cbk cbo cbr cbt cby cca ccb ccc ccf cck cco ccr cct cfa cfb cfc cff cfk cfo cfr cft cka ckb ckc cko ckt cky co- coa cob coc cof cok coo cor cot coy cra crb crc crf crk cro crr crt cry cta ctb ctc ctf ctk cto ctr ctt cty cya cyb cyc cyf cyk cyo cyr cyt faa fab fac faf fak fao far fat fay fba fbb fbc fbf fbk fbo fbr fbt fca fcb fcc fcf fck fco fcr fct fcy ffa ffc fff ffk ffo ffr fft ffy fka fkb fkc fkf fkk fkt foa fob foc fof fok foo for fot foy fra frb frc frf frk fro frr frt fry fta ftb ftc ftf ftk fto ftr ftt fty fy- fya fyb fyc fyk fyo k-t ka- kaa kab kac kaf kak kao kar kat kay kba kbb kbc kbf kbk kbo kbr kca kcb kcc kck kcr kct kfa kfc kff kfo kkb kkc kkk kkr kkt kky koa kob koc kof kok koo kor kot koy kra krc krf krk kro krr krt kry kta ktb ktc ktf ktk kto ktr ktt kya kyc kyo kyr kyt oaa oab oac oaf oak oao oar oat ob- oba obb obc obf obk obo obr obt oby oc- oca ocb occ ocf ock oco ocr oct of- ofa ofb ofc off ofo ofr oft oka okb okc okk oko okr oo- ooa oob ooc oof ook ooo oor oot or- ora orb orc orf ork oro orr ort ory ot- ota otb otc otf otk oto otr ott oya oyo ra- raa rab rac raf rak rao rar rat ray rba rbb rbc rbf rbk rbo rbr rbt rca rcb rcc rcf rco rcr rct rfa rfb rfc rff rfk rfo rfr rft rkb rkc rkf rkk rko rkt rky roa rob roc rof rok roo ror rot roy rra rrb rrc rrf rrk rrr rrt rta rtb rtc rtf rtk rto rtr rtt rty ry- rya ryc ryf ryk ryo ryr ryy taa tab tac taf tak tao tar tat tay tba tbb tbc tbf tbk tbo tbr tbt tca tcb tcc tcf tck tco tcr tct tfa tfb tfc tff tfk tfo tfr tft tka tkb tkc tkk tko tkr tkt tky to- toa tob toc tof tok too tor tot toy tra trb trc trf trk tro trr trt try tta ttb ttc ttf ttk tto ttr ttt tty tya tyc tyf tyo tyr tyt yaa yab yac yaf yak yao yar yat yay ybc ybf ybr yby yca ycc ycf yco ycy yfa yfc yff yfr yft yka ykk yob yoc yof yok yoo yor yot yoy yra yrc yrf yro yrt yta ytc ytf ytk yto ytr ytt yyb yyc yyf yyt yyy