a-a a-b a-c aaa aab aac aag aan aao aar aas aay ab- aba abb abc abg abn abo abr abs aby ac- aca acb acc acg acn aco acr acs acy ag- aga agb agc agg agn ago agr ags agy an- ana anb anc ang ann ano anr ans any aoa aob aoc aog aon aoo aor aos ar- ara arb arc arg arn aro arr ars ary as- asa asb asc asg asn aso asr ass asy ay- aya ayc ayn ayo ayr ays baa bab bac bag ban bao bar bas bay bba bbb bbc bbg bbn bbo bbr bbs bby bca bcb bcc bcg bcn bco bcr bcs bcy bga bgb bgc bgg bgn bgo bgr bgs bna bnb bnc bng bnn bno bnr bns boa bob boc bog bon boo bor bos boy bra brb brg brn bro brr brs bry bsa bsb bsc bsg bsn bso bsr bss bsy by- bya byc byg byn byo byr bys c-- caa cab cac cag can cao car cas cay cba cbb cbc cbg cbn cbo cbr cbs cby cca ccb ccc ccg ccn cco ccr ccs cga cgb cgc cgg cgn cgo cgr cgs cgy cn- cna cnb cnc cng cnn cno cnr cns cny co- coa cob coc cog con coo cor cos coy cra crb crc crg crn cro crr crs cry csa csb csc csg csn cso csr css csy cya cyb cyc cyg cyn cyo cyr cys gaa gab gac gag gan gao gar gas gay gba gbc gbg gbn gbo gbr gbs gby gca gcb gcc gcg gcn gco gcr gcs gga ggb ggc ggg ggn ggo ggr ggs gna gnb gnc gnn gno gnr gns goa gob goc gog gon goo gor gos goy gra grb grc grg grn gro grr grs gry gsa gsb gsc gsg gsn gso gsr gss gy- gya gyb gyn gyo gyr gys naa nab nac nag nan nao nar nas nay nba nbb nbc nbg nbn nbo nbr nbs nca ncb ncc ncg ncn nco ncr ncs nga ngb ngc ngg ngn ngo ngs nna nnb nnc nng nnn nno nns no- noa nob noc nog non noo nor nos noy nra nrb nrc nrg nrn nro nrr nrs nry nsa nsb nsc nsg nsn nso nsr nss nsy nya nyc nyg nyn nyo nys nyy oaa oab oac oag oan oao oar oas ob- oba obb obc obg obn obo obr obs oby oc- oca ocb occ ocg ocn oco ocr ocs oga ogc ogg ogn ogo ogs ogy on- ona onb onc ong onn ono onr ons ony oo- ooa oob ooc oog oon ooo oor oos or- ora orb orc org orn oro orr ors ory os- osa osb osc osg osn oso osr oss oya oyo oys ra- raa rab rac rag ran rao rar ras ray rba rbb rbc rbg rbn rbo rbr rbs rca rcb rcc rcg rcn rco rcr rcs rga rgb rgc rgg rgn rgo rgr rgs rna rnb rnc rng rnn rno rnr rns rny roa rob roc rog ron roo ror ros roy rra rrb rrc rrg rrn rrr rrs rsa rsb rsc rsg rsn rso rsr rss ry- rya ryc ryg ryn ryo ryr rys ryy saa sab sac sag san sao sar sas say sba sbb sbc sbg sbn sbo sbr sbs sby sca scb scc scg scn sco scr scs sga sgb sgc sgg sgn sgo sgr sgs sna snb snc sng snn sno snr sns sny soa sob soc sog son soo sor sos soy sr- sra srb src srg srn sro srr srs sry ss- ssa ssb ssc ssg ssn sso ssr sss sy- sya syb syc syg syn syr sys yaa yab yac yag yan yao yar yas yay ybc ybg ybr ybs yby yca ycc yco ycs ycy yga ygc ygo yna yng ynn yns yny yob yoc yog yon yoo yor yos yoy yra yrc yrg yrn yro yrs ysa ysb ysc ysg yso ysr yss ysy yyb yyc yyg yys yyy