-ic a-a a-b a-c a-i aaa aab aac aai aar aas aay ab- aba abb abc abi abr abs aby ac- aca acb acc aci acr acs acy ai- aia aib aic aii air ais aiy ar- ara arb arc ari arr ars ary as- asa asb asc asi asr ass asy ay- aya ayc ayi ayr ays baa bab bac bai bar bas bay bba bbb bbc bbi bbr bbs bby bca bcb bcc bci bcr bcs bcy bi- bia bib bic bii bir bis biy bra brb bri brr brs bry bsa bsb bsc bsi bsr bss bsy by- bya byc byi byr bys c-- caa cab cac cai car cas cay cba cbb cbc cbi cbr cbs cby cca ccb ccc cci ccr ccs ci- cia cib cic cii cir cis cra crb crc cri crr crs cry csa csb csc csi csr css csy cya cyb cyc cyr cys ia- iaa iab iac iai iar ias iba ibb ibc ibi ibr ibs iby ica icb icc ici icr ics icy iia iib iic iii iir iis ir- ira irb irc iri irr irs iry is- isa isb isc isi isr iss isy iya iyc iyr iys iyy ra- raa rab rac rai rar ras ray rba rbb rbc rbi rbr rbs rca rcb rcc rci rcr rcs ria rib ric rii rir ris riy rra rrb rrc rri rrr rrs rsa rsb rsc rsi rsr rss ry- rya ryc ryr rys ryy saa sab sac sai sar sas say sba sbb sbc sbi sbr sbs sby sca scb scc sci scr scs sia sib sic sii sir sis sr- sra srb src sri srr srs sry ss- ssa ssb ssc ssi ssr sss sy- sya syb syc syi syr sys yaa yab yac yai yar yas yay ybc ybi ybr ybs yby yca ycc yci ycs ycy yii yir yis yra yrc yrs ysa ysb ysc ysi ysr yss ysy yyb yyc yys yyy