a-a a-b a-c a-t aaa aab aac aao aar aat aau aay ab- aba abb abc abo abr abt abu aby ac- aca acb acc aco acr act acu acy aoa aob aoc aoo aor aot aou ar- ara arb arc aro arr art aru ary at- ata atb atc ato atr att atu au- aua aub auc auo aur aut ay- aya ayc ayo ayr ayt ayu b-u baa bab bac bao bar bat bau bay bba bbb bbc bbo bbr bbt bbu bby bca bcb bcc bco bcr bct bcu bcy boa bob boc boo bor bot bou boy bra brb bro brr brt bru bry bta btb btc bto btr btt btu bty bua bub buc buo bur but buu buy by- bya byc byo byr byt byu c-- caa cab cac cao car cat cau cay cba cbb cbc cbo cbr cbt cbu cby cca ccb ccc cco ccr cct ccu co- coa cob coc coo cor cot cou coy cra crb crc cro crr crt cru cry cta ctb ctc cto ctr ctt ctu cty cua cub cuc cuo cur cut cuu cuy cya cyb cyc cyo cyr cyt oaa oab oac oao oar oat oau ob- oba obb obc obo obr obt obu oby oc- oca ocb occ oco ocr oct ocu oo- ooa oob ooc ooo oor oot or- ora orb orc oro orr ort oru ory ot- ota otb otc oto otr ott otu ou- oua ouc ouo our out oya oyo ra- raa rab rac rao rar rat rau ray rba rbb rbc rbo rbr rbt rbu rca rcb rcc rco rcr rct rcu roa rob roc roo ror rot rou roy rra rrb rrc rrr rrt rru rta rtb rtc rto rtr rtt rtu rty rua rub ruc ruo rur rut ruu ruy ry- rya ryc ryo ryr ryu ryy taa tab tac tao tar tat tau tay tba tbb tbc tbo tbr tbt tbu tca tcb tcc tco tcr tct tcu to- toa tob toc too tor tot tou toy tra trb trc tro trr trt tru try tta ttb ttc tto ttr ttt ttu tty tua tub tuc tuo tur tut tuu tuy tya tyc tyo tyr tyt ua- uaa uab uac uao uar uat uau uay uba ubb ubc ubo ubr ubt ubu uby uca ucb ucc uco ucr uct ucu uoa uob uoc uoo uor uot ur- ura urb urc uro urr urt uru ury uta utb utc uto utr utt utu uty uua uuc uur uut uuu uyc uyo uyu yaa yab yac yao yar yat yau yay ybc ybr yby yca ycc yco ycu ycy yob yoc yoo yor yot you yoy yra yrc yro yrt yru yta ytc yto ytr ytt ytu yua yuo yur yut yuu yuy yyb yyc yyt yyu yyy