-ic a-a a-b a-c a-i a-t aaa aab aac aai aao aar aat aay ab- aba abb abc abi abo abr abt aby ac- aca acb acc aci aco acr act acy ai- aia aib aic aii aio air ait aiy aoa aob aoc aoi aoo aor aot ar- ara arb arc ari aro arr art ary at- ata atb atc ati ato atr att ay- aya ayc ayi ayo ayr ayt baa bab bac bai bao bar bat bay bba bbb bbc bbi bbo bbr bbt bby bca bcb bcc bci bco bcr bct bcy bi- bia bib bic bii bio bir bit biy boa bob boc boi boo bor bot boy bra brb bri bro brr brt bry bta btb btc bti bto btr btt bty by- bya byc byi byo byr byt c-- caa cab cac cai cao car cat cay cba cbb cbc cbi cbo cbr cbt cby cca ccb ccc cci cco ccr cct ci- cia cib cic cii cio cir cit co- coa cob coc coi coo cor cot coy cra crb crc cri cro crr crt cry cta ctb ctc cti cto ctr ctt cty cya cyb cyc cyo cyr cyt ia- iaa iab iac iai iao iar iat iba ibb ibc ibi ibo ibr ibt iby ica icb icc ici ico icr ict icy iia iib iic iii iio iir iit io- ioa iob ioc ioi ioo ior iot ir- ira irb irc iri iro irr irt iry ita itb itc iti ito itt ity iya iyc iyo iyr iyt iyy o-i oaa oab oac oai oao oar oat ob- oba obb obc obi obo obr obt oby oc- oca ocb occ oci oco ocr oct oia oib oic oii oio oir oit oo- ooa oob ooc ooi ooo oor oot or- ora orb orc ori oro orr ort ory ot- ota otb otc oti oto otr ott oya oyi oyo ra- raa rab rac rai rao rar rat ray rba rbb rbc rbi rbo rbr rbt rca rcb rcc rci rco rcr rct ria rib ric rii rio rir rit riy roa rob roc roi roo ror rot roy rra rrb rrc rri rrr rrt rta rtb rtc rti rto rtr rtt rty ry- rya ryc ryo ryr ryy taa tab tac tai tao tar tat tay tba tbb tbc tbi tbo tbr tbt tca tcb tcc tci tco tcr tct tia tib tic tii tio tir tit tiy to- toa tob toc toi too tor tot toy tra trb trc tri tro trr trt try tta ttb ttc tti tto ttr ttt tty tya tyc tyo tyr tyt yaa yab yac yai yao yar yat yay ybc ybi ybr yby yca ycc yci yco ycy yii yio yir yit yob yoc yoi yoo yor yot yoy yra yrc yro yrt yta ytc yto ytr ytt yyb yyc yyt yyy