-ic a-a a-b a-c a-i a-t aaa aab aac aai aak aao aat aau ab- aba abb abc abi abk abo abt abu ac- aca acb acc aci ack aco act acu ai- aia aib aic aii aik aio ait aiu aka akb akc aki akk ako aku aoa aob aoc aoi aok aoo aot aou at- ata atb atc ati ato att atu au- aua aub auc aui auk auo aut b-u baa bab bac bai bak bao bat bau bba bbb bbc bbi bbk bbo bbt bbu bca bcb bcc bci bck bco bct bcu bi- bia bib bic bii bik bio bit biu bka bkb bkc bkk bko bkt boa bob boc boi bok boo bot bou bta btb btc bti btk bto btt btu bua bub buc bui buk buo but buu c-- caa cab cac cai cak cao cat cau cba cbb cbc cbi cbk cbo cbt cbu cca ccb ccc cci cck cco cct ccu ci- cia cib cic cii cik cio cit ciu cka ckb ckc cki cko ckt co- coa cob coc coi cok coo cot cou cta ctb ctc cti ctk cto ctt ctu cua cub cuc cui cuk cuo cut cuu ia- iaa iab iac iai iao iat iau iba ibb ibc ibi ibk ibo ibt ibu ica icb icc ici ick ico ict icu iia iib iic iii iio iit iiu ika ikb ikc iki ikk iko ikt iku io- ioa iob ioc ioi ioo iot iou ita itb itc iti itk ito itt itu iu- iua iub iuc iui iut k-t ka- kaa kab kac kai kak kao kat kau kba kbb kbc kbi kbk kbo kbu kca kcb kcc kci kck kct kcu kia kib kic kii kik kio kit kiu kkb kkc kki kkk kkt kku koa kob koc koi kok koo kot kou kta ktb ktc ktk kto ktt ktu kub kuc kui kuk kut kuu o-i oaa oab oac oai oak oao oat oau ob- oba obb obc obi obk obo obt obu oc- oca ocb occ oci ock oco oct ocu oia oib oic oii oik oio oit oiu oka okb okc oki okk oko oku oo- ooa oob ooc ooi ook ooo oot ot- ota otb otc oti otk oto ott otu ou- oua ouc oui ouk ouo out taa tab tac tai tak tao tat tau tba tbb tbc tbi tbk tbo tbt tbu tca tcb tcc tci tck tco tct tcu tia tib tic tii tik tio tit tiu tka tkb tkc tkk tko tkt to- toa tob toc toi tok too tot tou tta ttb ttc tti ttk tto ttt ttu tua tub tuc tui tuk tuo tut tuu ua- uaa uab uac uai uak uao uat uau uba ubb ubc ubi ubk ubo ubt ubu uca ucb ucc uci uck uco uct ucu uia uib uic uii uio uit uiu uka ukb ukc uki ukk uku uoa uob uoc uok uoo uot uta utb utc uti utk uto utt utu uua uuc uut uuu