-er a-a a-b a-c aaa aab aac aae aag aap aar aas ab- aba abb abc abe abg abp abr abs ac- aca acb acc ace acg acp acr acs aea aeb aec aee aeg aep aer aes ag- aga agb agc age agg agp agr ags ap- apa apb apc ape apg app apr aps ar- ara arb arc are arg arp arr ars as- asa asb asc ase asg asp asr ass b-p baa bab bac bae bag bap bar bas bba bbb bbc bbe bbg bbp bbr bbs bca bcb bcc bce bcg bcp bcr bcs be- bea beb bec bee beg bep ber bes bga bgb bgc bge bgg bgp bgr bgs bpa bpb bpc bpe bpg bpp bpr bps bra brb bre brg brp brr brs bsa bsb bsc bse bsg bsp bsr bss c-- caa cab cac cae cag cap car cas cba cbb cbc cbe cbg cbp cbr cbs cca ccb ccc cce ccg ccp ccr ccs ce- cea ceb cec cee ceg cep cer ces cga cgb cgc cge cgg cgp cgr cgs cpa cpb cpc cpe cpg cpp cpr cps cra crb crc cre crg crp crr crs csa csb csc cse csg csp csr css eaa eab eac eae eag eap ear eas eba ebb ebc ebe ebg ebp ebr ebs ec- eca ecb ecc ece ecg ecr ecs eea eeb eec eee eeg eep eer ees ega egb egc ege egg egp egr egs ep- epa epb epc epe epg epp epr eps era erb erc ere erg erp err ers es- esa esb esc ese esg esp esr ess g-p gaa gab gac gae gag gap gar gas gba gbc gbe gbg gbp gbr gbs gca gcb gcc gce gcg gcp gcr gcs ge- gea geb gec gee geg gep ger ges gga ggb ggc ggg ggp ggr ggs gpa gpb gpc gpe gpg gpp gpr gps gra grb grc gre grg grp grr grs gsa gsb gsc gse gsg gsp gsr gss p-p paa pab pac pae pag pap par pas pba pbb pbc pbe pbg pbp pbr pbs pca pcb pcc pce pcg pcp pcr pcs pea peb pec pee peg pep per pes pga pgb pgc pge pgg pgp pgr pgs ppa ppb ppc ppe ppg ppp ppr pps pra prb prc pre prg prp prr prs ps- psa psb psc pse psg psp psr pss ra- raa rab rac rae rag rap rar ras rba rbb rbc rbe rbg rbp rbr rbs rca rcb rcc rce rcg rcp rcr rcs re- rea reb rec ree reg rep rer res rga rgb rgc rge rgg rgp rgr rgs rpa rpb rpc rpe rpg rpp rpr rps rra rrb rrc rrg rrp rrr rrs rsa rsb rsc rse rsg rsp rsr rss saa sab sac sae sag sap sar sas sba sbb sbc sbe sbg sbp sbr sbs sca scb scc sce scg scp scr scs se- sea seb sec see seg sep ser ses sga sgb sgc sge sgg sgp sgr sgs spa spb spc spe spg spp spr sps sr- sra srb src sre srg srp srr srs ss- ssa ssb ssc sse ssg ssp ssr sss