a-a a-b a-c a-t aaa aab aac aao aar aas aat aau aay ab- aba abb abc abo abr abs abt abu aby ac- aca acb acc aco acr acs act acu acy aoa aob aoc aoo aor aos aot aou ar- ara arb arc aro arr ars art aru ary as- asa asb asc aso asr ass ast asu asy at- ata atb atc ato atr ats att atu au- aua aub auc auo aur aus aut ay- aya ayc ayo ayr ays ayt ayu b-u baa bab bac bao bar bas bat bau bay bba bbb bbc bbo bbr bbs bbt bbu bby bca bcb bcc bco bcr bcs bct bcu bcy boa bob boc boo bor bos bot bou boy bra brb bro brr brs brt bru bry bsa bsb bsc bso bsr bss bst bsu bsy bta btb btc bto btr bts btt btu bty bua bub buc buo bur bus but buu buy by- bya byc byo byr bys byt byu c-- caa cab cac cao car cas cat cau cay cba cbb cbc cbo cbr cbs cbt cbu cby cca ccb ccc cco ccr ccs cct ccu co- coa cob coc coo cor cos cot cou coy cra crb crc cro crr crs crt cru cry csa csb csc cso csr css cst csu csy cta ctb ctc cto ctr cts ctt ctu cty cua cub cuc cuo cur cus cut cuu cuy cya cyb cyc cyo cyr cys cyt oaa oab oac oao oar oas oat oau ob- oba obb obc obo obr obs obt obu oby oc- oca ocb occ oco ocr ocs oct ocu oo- ooa oob ooc ooo oor oos oot or- ora orb orc oro orr ors ort oru ory os- osa osb osc oso osr oss ost osu ot- ota otb otc oto otr ots ott otu ou- oua ouc ouo our ous out oya oyo oys ra- raa rab rac rao rar ras rat rau ray rba rbb rbc rbo rbr rbs rbt rbu rca rcb rcc rco rcr rcs rct rcu roa rob roc roo ror ros rot rou roy rra rrb rrc rrr rrs rrt rru rsa rsb rsc rso rsr rss rst rsu rta rtb rtc rto rtr rts rtt rtu rty rua rub ruc ruo rur rus rut ruu ruy ry- rya ryc ryo ryr rys ryu ryy saa sab sac sao sar sas sat sau say sba sbb sbc sbo sbr sbs sbt sbu sby sca scb scc sco scr scs sct scu soa sob soc soo sor sos sot sou soy sr- sra srb src sro srr srs srt sry ss- ssa ssb ssc sso ssr sss sst ssu sta stb stc sto str sts stt stu sty sua sub suc suo sur sus sut suu suy sy- sya syb syc syr sys syt syu taa tab tac tao tar tas tat tau tay tba tbb tbc tbo tbr tbs tbt tbu tca tcb tcc tco tcr tcs tct tcu to- toa tob toc too tor tos tot tou toy tra trb trc tro trr trs trt tru try tsa tsb tsc tso tsr tss tst tsu tsy tta ttb ttc tto ttr tts ttt ttu tty tua tub tuc tuo tur tus tut tuu tuy tya tyc tyo tyr tys tyt ua- uaa uab uac uao uar uas uat uau uay uba ubb ubc ubo ubr ubs ubt ubu uby uca ucb ucc uco ucr ucs uct ucu uoa uob uoc uoo uor uos uot ur- ura urb urc uro urr urs urt uru ury usa usb usc uso usr uss ust usu uta utb utc uto utr uts utt utu uty uua uuc uur uus uut uuu uyc uyo uys uyu yaa yab yac yao yar yas yat yau yay ybc ybr ybs yby yca ycc yco ycs ycu ycy yob yoc yoo yor yos yot you yoy yra yrc yro yrs yrt yru ysa ysb ysc yso ysr yss yst ysu ysy yta ytc yto ytr yts ytt ytu yua yuo yur yus yut yuu yuy yyb yyc yys yyt yyu yyy