-ic a-a a-b a-c a-i a-t aaa aab aac aai aar aat aay ab- aba abb abc abi abr abt aby ac- aca acb acc aci acr act acy ai- aia aib aic aii air ait aiy ar- ara arb arc ari arr art ary at- ata atb atc ati atr att ay- aya ayc ayi ayr ayt baa bab bac bai bar bat bay bba bbb bbc bbi bbr bbt bby bca bcb bcc bci bcr bct bcy bi- bia bib bic bii bir bit biy bra brb bri brr brt bry bta btb btc bti btr btt bty by- bya byc byi byr byt c-- caa cab cac cai car cat cay cba cbb cbc cbi cbr cbt cby cca ccb ccc cci ccr cct ci- cia cib cic cii cir cit cra crb crc cri crr crt cry cta ctb ctc cti ctr ctt cty cya cyb cyc cyr cyt ia- iaa iab iac iai iar iat iba ibb ibc ibi ibr ibt iby ica icb icc ici icr ict icy iia iib iic iii iir iit ir- ira irb irc iri irr irt iry ita itb itc iti itt ity iya iyc iyr iyt iyy ra- raa rab rac rai rar rat ray rba rbb rbc rbi rbr rbt rca rcb rcc rci rcr rct ria rib ric rii rir rit riy rra rrb rrc rri rrr rrt rta rtb rtc rti rtr rtt rty ry- rya ryc ryr ryy taa tab tac tai tar tat tay tba tbb tbc tbi tbr tbt tca tcb tcc tci tcr tct tia tib tic tii tir tit tiy tra trb trc tri trr trt try tta ttb ttc tti ttr ttt tty tya tyc tyr tyt yaa yab yac yai yar yat yay ybc ybi ybr yby yca ycc yci ycy yii yir yit yra yrc yrt yta ytc ytr ytt yyb yyc yyt yyy