-er a-a a-c aaa aac aae aag aaj aar aas ac- aca acc ace acg acj acr acs aea aec aee aeg aej aer aes ag- aga agc age agg agj agr ags aja ajc aje ajj ajr ajs ar- ara arc are arg arj arr ars as- asa asc ase asg asj asr ass c-- c-j caa cac cae cag caj car cas cca ccc cce ccg ccj ccr ccs ce- cea cec cee ceg cej cer ces cga cgc cge cgg cgr cgs cja cjc cjg cjr cjs cra crc cre crg crj crr crs csa csc cse csg csj csr css eaa eac eae eag eaj ear eas ec- eca ecc ece ecg ecj ecr ecs eea eec eee eeg eer ees ega egc ege egg egr egs eja ejc era erc ere erg err ers es- esa esc ese esg esr ess gaa gac gae gag gaj gar gas gca gcc gce gcg gcr gcs ge- gea gec gee geg ger ges gga ggc ggg ggj ggr ggs gja gjc gje gjg gjr gra grc gre grg grj grr grs gsa gsc gse gsg gsj gsr gss jaa jac jae jag jaj jar jas jca jcc jce jcr jcs jea jec jee jeg jej jer jes jga jge jgr jgs jja jjc jjg jjj jjr jjs jra jrc jrg jrr jrs jsa jsc jse jsg jsj jsr jss ra- raa rac rae rag raj rar ras rca rcc rce rcg rcj rcr rcs re- rea rec ree reg rer res rga rgc rge rgg rgr rgs rja rjc rjg rjr rra rrc rrg rrr rrs rsa rsc rse rsg rsj rsr rss saa sac sae sag saj sar sas sca scc sce scg scj scr scs se- sea sec see seg sej ser ses sga sgc sge sgg sgr sgs sja sjc sje sjj sjr sjs sr- sra src sre srg srj srr srs ss- ssa ssc sse ssg ssj ssr sss