a-a a-b a-t aaa aab aak aao aar aas aat aay ab- aba abb abk abo abr abs abt aby aka akb akk ako akr aks aoa aob aok aoo aor aos aot ar- ara arb ark aro arr ars art ary as- asa asb ask aso asr ass ast asy at- ata atb ato atr ats att ay- aya ayk ayo ayr ays ayt baa bab bak bao bar bas bat bay bba bbb bbk bbo bbr bbs bbt bby bka bkb bkk bko bkr bks bkt boa bob bok boo bor bos bot boy bra brb brk bro brr brs brt bry bsa bsb bsk bso bsr bss bst bsy bta btb btk bto btr bts btt bty by- bya byk byo byr bys byt k-t ka- kaa kab kak kao kar kas kat kay kba kbb kbk kbo kbr kbs kkb kkk kkr kks kkt kky koa kob kok koo kor kos kot koy kra krk kro krr krs krt kry ksa ksb ksk kso ksr kss kst kta ktb ktk kto ktr kts ktt kya kyo kyr kys kyt oaa oab oak oao oar oas oat ob- oba obb obk obo obr obs obt oby oka okb okk oko okr oks oo- ooa oob ook ooo oor oos oot or- ora orb ork oro orr ors ort ory os- osa osb osk oso osr oss ost ot- ota otb otk oto otr ots ott oya oyo oys ra- raa rab rak rao rar ras rat ray rba rbb rbk rbo rbr rbs rbt rkb rkk rko rks rkt rky roa rob rok roo ror ros rot roy rra rrb rrk rrr rrs rrt rsa rsb rsk rso rsr rss rst rta rtb rtk rto rtr rts rtt rty ry- rya ryk ryo ryr rys ryy saa sab sak sao sar sas sat say sba sbb sbk sbo sbr sbs sbt sby sk- ska skb skk sko skr sks skt sky soa sob sok soo sor sos sot soy sr- sra srb srk sro srr srs srt sry ss- ssa ssb ssk sso ssr sss sst sta stb stk sto str sts stt sty sy- sya syb syk syr sys syt taa tab tak tao tar tas tat tay tba tbb tbk tbo tbr tbs tbt tka tkb tkk tko tkr tks tkt tky to- toa tob tok too tor tos tot toy tra trb trk tro trr trs trt try tsa tsb tsk tso tsr tss tst tsy tta ttb ttk tto ttr tts ttt tty tya tyo tyr tys tyt yaa yab yak yao yar yas yat yay ybr ybs yby yka ykk yob yok yoo yor yos yot yoy yra yro yrs yrt ysa ysb ysk yso ysr yss yst ysy yta ytk yto ytr yts ytt yyb yys yyt yyy