-ic a-a a-b a-c a-i aaa aab aac aag aai aar aas aay ab- aba abb abc abg abi abr abs aby ac- aca acb acc acg aci acr acs acy ag- aga agb agc agg agi agr ags agy ai- aia aib aic aig aii air ais aiy ar- ara arb arc arg ari arr ars ary as- asa asb asc asg asi asr ass asy ay- aya ayc ayi ayr ays baa bab bac bag bai bar bas bay bba bbb bbc bbg bbi bbr bbs bby bca bcb bcc bcg bci bcr bcs bcy bga bgb bgc bgg bgi bgr bgs bi- bia bib bic big bii bir bis biy bra brb brg bri brr brs bry bsa bsb bsc bsg bsi bsr bss bsy by- bya byc byg byi byr bys c-- caa cab cac cag cai car cas cay cba cbb cbc cbg cbi cbr cbs cby cca ccb ccc ccg cci ccr ccs cga cgb cgc cgg cgi cgr cgs cgy ci- cia cib cic cig cii cir cis cra crb crc crg cri crr crs cry csa csb csc csg csi csr css csy cya cyb cyc cyg cyr cys gaa gab gac gag gai gar gas gay gba gbc gbg gbi gbr gbs gby gca gcb gcc gcg gci gcr gcs gga ggb ggc ggg ggi ggr ggs gia gib gic gig gii gir gis giy gra grb grc grg gri grr grs gry gsa gsb gsc gsg gsi gsr gss gy- gya gyb gyr gys ia- iaa iab iac iag iai iar ias iba ibb ibc ibg ibi ibr ibs iby ica icb icc icg ici icr ics icy iga igb igc igg igi igr igs igy iia iib iic iii iir iis ir- ira irb irc irg iri irr irs iry is- isa isb isc isg isi isr iss isy iya iyc iyr iys iyy ra- raa rab rac rag rai rar ras ray rba rbb rbc rbg rbi rbr rbs rca rcb rcc rcg rci rcr rcs rga rgb rgc rgg rgi rgr rgs ria rib ric rig rii rir ris riy rra rrb rrc rrg rri rrr rrs rsa rsb rsc rsg rsi rsr rss ry- rya ryc ryg ryr rys ryy saa sab sac sag sai sar sas say sba sbb sbc sbg sbi sbr sbs sby sca scb scc scg sci scr scs sga sgb sgc sgg sgi sgr sgs sia sib sic sig sii sir sis sr- sra srb src srg sri srr srs sry ss- ssa ssb ssc ssg ssi ssr sss sy- sya syb syc syg syi syr sys yaa yab yac yag yai yar yas yay ybc ybg ybi ybr ybs yby yca ycc yci ycs ycy yga ygc yig yii yir yis yra yrc yrg yrs ysa ysb ysc ysg ysi ysr yss ysy yyb yyc yyg yys yyy