a-a a-b a-c aaa aab aac aag aap aar aas ab- aba abb abc abg abp abr abs ac- aca acb acc acg acp acr acs ag- aga agb agc agg agp agr ags ap- apa apb apc apg app apr aps ar- ara arb arc arg arp arr ars as- asa asb asc asg asp asr ass b-p baa bab bac bag bap bar bas bba bbb bbc bbg bbp bbr bbs bca bcb bcc bcg bcp bcr bcs bga bgb bgc bgg bgp bgr bgs bpa bpb bpc bpg bpp bpr bps bra brb brg brp brr brs bsa bsb bsc bsg bsp bsr bss c-- caa cab cac cag cap car cas cba cbb cbc cbg cbp cbr cbs cca ccb ccc ccg ccp ccr ccs cga cgb cgc cgg cgp cgr cgs cpa cpb cpc cpg cpp cpr cps cra crb crc crg crp crr crs csa csb csc csg csp csr css g-p gaa gab gac gag gap gar gas gba gbc gbg gbp gbr gbs gca gcb gcc gcg gcp gcr gcs gga ggb ggc ggg ggp ggr ggs gpa gpb gpc gpg gpp gpr gps gra grb grc grg grp grr grs gsa gsb gsc gsg gsp gsr gss p-p paa pab pac pag pap par pas pba pbb pbc pbg pbp pbr pbs pca pcb pcc pcg pcp pcr pcs pga pgb pgc pgg pgp pgr pgs ppa ppb ppc ppg ppp ppr pps pra prb prc prg prp prr prs ps- psa psb psc psg psp psr pss ra- raa rab rac rag rap rar ras rba rbb rbc rbg rbp rbr rbs rca rcb rcc rcg rcp rcr rcs rga rgb rgc rgg rgp rgr rgs rpa rpb rpc rpg rpp rpr rps rra rrb rrc rrg rrp rrr rrs rsa rsb rsc rsg rsp rsr rss saa sab sac sag sap sar sas sba sbb sbc sbg sbp sbr sbs sca scb scc scg scp scr scs sga sgb sgc sgg sgp sgr sgs spa spb spc spg spp spr sps sr- sra srb src srg srp srr srs ss- ssa ssb ssc ssg ssp ssr sss