a-a a-b a-c a-t aaa aab aac aan aao aar aat aau ab- aba abb abc abn abo abr abt abu ac- aca acb acc acn aco acr act acu an- ana anb anc ann ano anr ant anu aoa aob aoc aon aoo aor aot aou ar- ara arb arc arn aro arr art aru at- ata atb atc atn ato atr att atu au- aua aub auc aun auo aur aut b-u baa bab bac ban bao bar bat bau bba bbb bbc bbn bbo bbr bbt bbu bca bcb bcc bcn bco bcr bct bcu bna bnb bnc bnn bno bnr bnt bnu boa bob boc bon boo bor bot bou bra brb brn bro brr brt bru bta btb btc btn bto btr btt btu bua bub buc bun buo bur but buu c-- caa cab cac can cao car cat cau cba cbb cbc cbn cbo cbr cbt cbu cca ccb ccc ccn cco ccr cct ccu cn- cna cnb cnc cnn cno cnr cnt cnu co- coa cob coc con coo cor cot cou cra crb crc crn cro crr crt cru cta ctb ctc ctn cto ctr ctt ctu cua cub cuc cun cuo cur cut cuu naa nab nac nan nao nar nat nau nba nbb nbc nbn nbo nbr nbt nbu nca ncb ncc ncn nco ncr nct ncu nna nnb nnc nnn nno nnt nnu no- noa nob noc non noo nor not nou nra nrb nrc nrn nro nrr nrt nru nta ntb ntc ntn nto ntr ntt ntu nua nub nuc nun nuo nur nut nuu oaa oab oac oan oao oar oat oau ob- oba obb obc obn obo obr obt obu oc- oca ocb occ ocn oco ocr oct ocu on- ona onb onc onn ono onr ont onu oo- ooa oob ooc oon ooo oor oot or- ora orb orc orn oro orr ort oru ot- ota otb otc otn oto otr ott otu ou- oua ouc oun ouo our out ra- raa rab rac ran rao rar rat rau rba rbb rbc rbn rbo rbr rbt rbu rca rcb rcc rcn rco rcr rct rcu rna rnb rnc rnn rno rnr rnt rnu roa rob roc ron roo ror rot rou rra rrb rrc rrn rrr rrt rru rta rtb rtc rtn rto rtr rtt rtu rua rub ruc run ruo rur rut ruu taa tab tac tan tao tar tat tau tba tbb tbc tbn tbo tbr tbt tbu tca tcb tcc tcn tco tcr tct tcu tna tnb tnc tnn tno tnr tnt to- toa tob toc ton too tor tot tou tra trb trc trn tro trr trt tru tta ttb ttc ttn tto ttr ttt ttu tua tub tuc tun tuo tur tut tuu ua- uaa uab uac uan uao uar uat uau uba ubb ubc ubn ubo ubr ubt ubu uca ucb ucc ucn uco ucr uct ucu un- una unb unc unn uno unr unt unu uoa uob uoc uon uoo uor uot ur- ura urb urc urn uro urr urt uru uta utb utc utn uto utr utt utu uua uuc uun uur uut uuu