-ic a-a a-b a-c a-i aaa aab aac aag aai aar aas ab- aba abb abc abg abi abr abs ac- aca acb acc acg aci acr acs ag- aga agb agc agg agi agr ags ai- aia aib aic aig aii air ais ar- ara arb arc arg ari arr ars as- asa asb asc asg asi asr ass baa bab bac bag bai bar bas bba bbb bbc bbg bbi bbr bbs bca bcb bcc bcg bci bcr bcs bga bgb bgc bgg bgi bgr bgs bi- bia bib bic big bii bir bis bra brb brg bri brr brs bsa bsb bsc bsg bsi bsr bss c-- caa cab cac cag cai car cas cba cbb cbc cbg cbi cbr cbs cca ccb ccc ccg cci ccr ccs cga cgb cgc cgg cgi cgr cgs ci- cia cib cic cig cii cir cis cra crb crc crg cri crr crs csa csb csc csg csi csr css gaa gab gac gag gai gar gas gba gbc gbg gbi gbr gbs gca gcb gcc gcg gci gcr gcs gga ggb ggc ggg ggi ggr ggs gia gib gic gig gii gir gis gra grb grc grg gri grr grs gsa gsb gsc gsg gsi gsr gss ia- iaa iab iac iag iai iar ias iba ibb ibc ibg ibi ibr ibs ica icb icc icg ici icr ics iga igb igc igg igi igr igs iia iib iic iii iir iis ir- ira irb irc irg iri irr irs is- isa isb isc isg isi isr iss ra- raa rab rac rag rai rar ras 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 rra rrb rrc rrg rri rrr rrs rsa rsb rsc rsg rsi rsr rss saa sab sac sag sai sar sas sba sbb sbc sbg sbi sbr sbs 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 ss- ssa ssb ssc ssg ssi ssr sss