-ic a-a a-b a-c a-i a-t aaa aab aac aai aar aas aat aay ab- aba abb abc abi abr abs abt aby ac- aca acb acc aci acr acs act acy ai- aia aib aic aii air ais ait aiy ar- ara arb arc ari arr ars art ary as- asa asb asc asi asr ass ast asy at- ata atb atc ati atr ats att ay- aya ayc ayi ayr ays ayt baa bab bac bai bar bas bat bay bba bbb bbc bbi bbr bbs bbt bby bca bcb bcc bci bcr bcs bct bcy bi- bia bib bic bii bir bis bit biy bra brb bri brr brs brt bry bsa bsb bsc bsi bsr bss bst bsy bta btb btc bti btr bts btt bty by- bya byc byi byr bys byt c-- caa cab cac cai car cas cat cay cba cbb cbc cbi cbr cbs cbt cby cca ccb ccc cci ccr ccs cct ci- cia cib cic cii cir cis cit cra crb crc cri crr crs crt cry csa csb csc csi csr css cst csy cta ctb ctc cti ctr cts ctt cty cya cyb cyc cyr cys cyt ia- iaa iab iac iai iar ias iat iba ibb ibc ibi ibr ibs ibt iby ica icb icc ici icr ics ict icy iia iib iic iii iir iis iit ir- ira irb irc iri irr irs irt iry is- isa isb isc isi isr iss ist isy ita itb itc iti its itt ity iya iyc iyr iys iyt iyy ra- raa rab rac rai rar ras rat ray rba rbb rbc rbi rbr rbs rbt rca rcb rcc rci rcr rcs rct ria rib ric rii rir ris rit riy rra rrb rrc rri rrr rrs rrt rsa rsb rsc rsi rsr rss rst rta rtb rtc rti rtr rts rtt rty ry- rya ryc ryr rys ryy saa sab sac sai sar sas sat say sba sbb sbc sbi sbr sbs sbt sby sca scb scc sci scr scs sct sia sib sic sii sir sis sit sr- sra srb src sri srr srs srt sry ss- ssa ssb ssc ssi ssr sss sst sta stb stc sti str sts stt sty sy- sya syb syc syi syr sys syt taa tab tac tai tar tas tat tay tba tbb tbc tbi tbr tbs tbt tca tcb tcc tci tcr tcs tct tia tib tic tii tir tis tit tiy tra trb trc tri trr trs trt try tsa tsb tsc tsi tsr tss tst tsy tta ttb ttc tti ttr tts ttt tty tya tyc tyr tys tyt yaa yab yac yai yar yas yat yay ybc ybi ybr ybs yby yca ycc yci ycs ycy yii yir yis yit yra yrc yrs yrt ysa ysb ysc ysi ysr yss yst ysy yta ytc ytr yts ytt yyb yyc yys yyt yyy