-ic a-a a-b a-c a-i aaa aab aac aag aai aak aar aas ab- aba abb abc abg abi abk abr abs ac- aca acb acc acg aci ack acr acs ag- aga agb agc agg agi agk agr ags ai- aia aib aic aig aii aik air ais aka akb akc akg aki akk akr aks ar- ara arb arc arg ari ark arr ars as- asa asb asc asg asi ask asr ass baa bab bac bag bai bak bar bas bba bbb bbc bbg bbi bbk bbr bbs bca bcb bcc bcg bci bck bcr bcs bga bgb bgc bgg bgi bgk bgr bgs bi- bia bib bic big bii bik bir bis bka bkb bkc bkg bkk bkr bks bra brb brg bri brk brr brs bsa bsb bsc bsg bsi bsk bsr bss c-- caa cab cac cag cai cak car cas cba cbb cbc cbg cbi cbk cbr cbs cca ccb ccc ccg cci cck ccr ccs cga cgb cgc cgg cgi cgr cgs ci- cia cib cic cig cii cik cir cis cka ckb ckc cki cks cra crb crc crg cri crk crr crs csa csb csc csg csi csk csr css gaa gab gac gag gai gak gar gas gba gbc gbg gbi gbk gbr gbs gca gcb gcc gcg gci gck gcr gcs gga ggb ggc ggg ggi ggr ggs gia gib gic gig gii gik gir gis gka gkb gks gra grb grc grg gri grk grr grs gsa gsb gsc gsg gsi gsk gsr gss ia- iaa iab iac iag iai iar ias iba ibb ibc ibg ibi ibk ibr ibs ica icb icc icg ici ick icr ics iga igb igc igg igi igk igr igs iia iib iic iii iir iis ika ikb ikc iki ikk ikr iks ir- ira irb irc irg iri irk irr irs is- isa isb isc isg isi isk isr iss ka- kaa kab kac kag kai kak kar kas kba kbb kbc kbi kbk kbr kbs kca kcb kcc kcg kci kck kcr kcs kga kgb kgc kgi kgs kia kib kic kig kii kik kir kis kkb kkc kki kkk kkr kks kra krc krg kri krk krr krs ksa ksb ksc ksg ksi ksk ksr kss ra- raa rab rac rag rai rak rar ras rba rbb rbc rbg rbi rbk rbr rbs rca rcb rcc rcg rci rcr rcs rga rgb rgc rgg rgi rgk rgr rgs ria rib ric rig rii rik rir ris rkb rkc rkg rkk rks rra rrb rrc rrg rri rrk rrr rrs rsa rsb rsc rsg rsi rsk rsr rss saa sab sac sag sai sak sar sas sba sbb sbc sbg sbi sbk sbr sbs sca scb scc scg sci sck scr scs sga sgb sgc sgg sgi sgk sgr sgs sia sib sic sig sii sik sir sis sk- ska skb skc skg ski skk skr sks sr- sra srb src srg sri srk srr srs ss- ssa ssb ssc ssg ssi ssk ssr sss