-th a-a a-b a-c a-t aaa aab aac aah aao aar aat aau ab- aba abb abc abh abo abr abt abu ac- aca acb acc ach aco acr act acu aha ahb ahc ahh aho ahr aht ahu aoa aob aoc aoh aoo aor aot aou ar- ara arb arc arh aro arr art aru at- ata atb atc ath ato atr att atu au- aua aub auc auh auo aur aut b-u baa bab bac bah bao bar bat bau bba bbb bbc bbh bbo bbr bbt bbu bca bcb bcc bch bco bcr bct bcu bha bhb bhc bhh bho bhr bht bhu boa bob boc boh boo bor bot bou bra brb brh bro brr brt bru bta btb btc bth bto btr btt btu bua bub buc buh buo bur but buu c-- caa cab cac cah cao car cat cau cba cbb cbc cbh cbo cbr cbt cbu cca ccb ccc cch cco ccr cct ccu ch- cha chb chc chh cho chr cht chu co- coa cob coc coh coo cor cot cou cra crb crc crh cro crr crt cru cta ctb ctc cth cto ctr ctt ctu cua cub cuc cuh cuo cur cut cuu haa hab hac hah hao har hat hau hba hbb hbc hbh hbo hbr hbt hbu hca hcb hcc hch hco hcr hct hha hhb hhc hhh hho hhr hht hhu hoa hob hoc hoh hoo hor hot hou hr- hra hrb hrc hrh hro hrr hrt hru hta htb htc hth hto htr htt hua hub huc huh huo hur hut huu oaa oab oac oah oao oar oat oau ob- oba obb obc obh obo obr obt obu oc- oca ocb occ och oco ocr oct ocu oha ohc ohh oho ohr oht ohu oo- ooa oob ooc ooh ooo oor oot or- ora orb orc orh oro orr ort oru ot- ota otb otc oth oto otr ott otu ou- oua ouc ouh ouo our out ra- raa rab rac rah rao rar rat rau rba rbb rbc rbh rbo rbr rbt rbu rca rcb rcc rch rco rcr rct rcu rh- rha rhb rhc rhh rho rhr rht rhu roa rob roc roh roo ror rot rou rra rrb rrc rrh rrr rrt rru rta rtb rtc rto rtr rtt rtu rua rub ruc ruh ruo rur rut ruu taa tab tac tah tao tar tat tau tba tbb tbc tbh tbo tbr tbt tbu tca tcb tcc tch tco tcr tct tcu th- tha thb thc thh tho thr tht thu to- toa tob toc toh too tor tot tou tra trb trc trh tro trr trt tru tta ttb ttc tth tto ttr ttt ttu tua tub tuc tuh tuo tur tut tuu ua- uaa uab uac uah uao uar uat uau uba ubb ubc ubh ubo ubr ubt ubu uca ucb ucc uch uco ucr uct ucu uha uhb uhc uhh uho uhr uht uhu uoa uob uoc uoo uor uot ur- ura urb urc uro urr urt uru uta utb utc uth uto utr utt utu uua uuc uur uut uuu