-ic a-a a-b a-c a-i aaa aab aac aag aai aak aas ab- aba abb abc abg abi abk abs ac- aca acb acc acg aci ack acs ag- aga agb agc agg agi agk ags ai- aia aib aic aig aii aik ais aka akb akc akg aki akk aks as- asa asb asc asg asi ask ass baa bab bac bag bai bak bas bba bbb bbc bbg bbi bbk bbs bca bcb bcc bcg bci bck bcs bga bgb bgc bgg bgi bgk bgs bi- bia bib bic big bii bik bis bka bkb bkc bkg bkk bks bsa bsb bsc bsg bsi bsk bss c-- caa cab cac cag cai cak cas cba cbb cbc cbg cbi cbk cbs cca ccb ccc ccg cci cck ccs cga cgb cgc cgg cgi cgs ci- cia cib cic cig cii cik cis cka ckb ckc cki cks csa csb csc csg csi csk css gaa gab gac gag gai gak gas gba gbc gbg gbi gbk gbs gca gcb gcc gcg gci gck gcs gga ggb ggc ggg ggi ggs gia gib gic gig gii gik gis gka gkb gks gsa gsb gsc gsg gsi gsk gss ia- iaa iab iac iag iai ias iba ibb ibc ibg ibi ibk ibs ica icb icc icg ici ick ics iga igb igc igg igi igk igs iia iib iic iii iis ika ikb ikc iki ikk iks is- isa isb isc isg isi isk iss ka- kaa kab kac kag kai kak kas kba kbb kbc kbi kbk kbs kca kcb kcc kcg kci kck kcs kga kgb kgc kgi kgs kia kib kic kig kii kik kis kkb kkc kki kkk kks ksa ksb ksc ksg ksi ksk kss saa sab sac sag sai sak sas sba sbb sbc sbg sbi sbk sbs sca scb scc scg sci sck scs sga sgb sgc sgg sgi sgk sgs sia sib sic sig sii sik sis sk- ska skb skc skg ski skk sks ss- ssa ssb ssc ssg ssi ssk sss