-ic a-a a-b a-c a-i a-t aaa aab aac aai aao aar aat aau ab- aba abb abc abi abo abr abt abu ac- aca acb acc aci aco acr act acu ai- aia aib aic aii aio air ait aiu aoa aob aoc aoi aoo aor aot aou ar- ara arb arc ari aro arr art aru at- ata atb atc ati ato atr att atu au- aua aub auc aui auo aur aut b-u baa bab bac bai bao bar bat bau bba bbb bbc bbi bbo bbr bbt bbu bca bcb bcc bci bco bcr bct bcu bi- bia bib bic bii bio bir bit biu boa bob boc boi boo bor bot bou bra brb bri bro brr brt bru bta btb btc bti bto btr btt btu bua bub buc bui buo bur but buu c-- caa cab cac cai cao car cat cau cba cbb cbc cbi cbo cbr cbt cbu cca ccb ccc cci cco ccr cct ccu ci- cia cib cic cii cio cir cit ciu co- coa cob coc coi coo cor cot cou cra crb crc cri cro crr crt cru cta ctb ctc cti cto ctr ctt ctu cua cub cuc cui cuo cur cut cuu ia- iaa iab iac iai iao iar iat iau iba ibb ibc ibi ibo ibr ibt ibu ica icb icc ici ico icr ict icu iia iib iic iii iio iir iit iiu io- ioa iob ioc ioi ioo ior iot iou ir- ira irb irc iri iro irr irt iru ita itb itc iti ito itt itu iu- iua iub iuc iui iur iut o-i oaa oab oac oai oao oar oat oau ob- oba obb obc obi obo obr obt obu oc- oca ocb occ oci oco ocr oct ocu oia oib oic oii oio oir oit oiu oo- ooa oob ooc ooi ooo oor oot or- ora orb orc ori oro orr ort oru ot- ota otb otc oti oto otr ott otu ou- oua ouc oui ouo our out ra- raa rab rac rai rao rar rat rau rba rbb rbc rbi rbo rbr rbt rbu rca rcb rcc rci rco rcr rct rcu ria rib ric rii rio rir rit roa rob roc roi roo ror rot rou rra rrb rrc rri rrr rrt rru rta rtb rtc rti rto rtr rtt rtu rua rub ruc rui ruo rur rut ruu taa tab tac tai tao tar tat tau tba tbb tbc tbi tbo tbr tbt tbu tca tcb tcc tci tco tcr tct tcu tia tib tic tii tio tir tit tiu to- toa tob toc toi too tor tot tou tra trb trc tri tro trr trt tru tta ttb ttc tti tto ttr ttt ttu tua tub tuc tui tuo tur tut tuu ua- uaa uab uac uai uao uar uat uau uba ubb ubc ubi ubo ubr ubt ubu uca ucb ucc uci uco ucr uct ucu uia uib uic uii uio uir uit uiu uoa uob uoc uoo uor uot ur- ura urb urc uri uro urr urt uru uta utb utc uti uto utr utt utu uua uuc uur uut uuu