-er a-a a-c a-z aaa aac aad aae aag aar aaz ac- aca acc acd ace acg acr acz ad- ada adc add ade adg adr adz aea aec aed aee aeg aer aez ag- aga agc agd age agg agr agz ar- ara arc ard are arg arr arz az- aza azd aze azg azz c-- caa cac cad cae cag car caz cca ccc ccd cce ccg ccr ccz cda cdc cdd cde cdg cdr cdz ce- cea cec ced cee ceg cer cez cga cgc cgd cge cgg cgr cra crc crd cre crg crr crz cz- czc czd cze daa dac dad dae dag dar daz dca dcc dcd dce dcg dcr dda ddc ddd dde ddg ddr ddz de- dea dec ded dee deg der dez dga dgc dgd dge dgg dgr dgz dra drc drd dre drg drr drz dza dzd dze dzr eaa eac ead eae eag ear eaz ec- eca ecc ecd ece ecg ecr ed- eda edc edd ede edg edr eea eec eed eee eeg eer ega egc egd ege egg egr era erc erd ere erg err erz eze ezr ezz g-d gaa gac gad gae gag gar gaz gca gcc gcd gce gcg gcr gda gdc gdd gde gdr ge- gea gec ged gee geg ger gez gga ggc ggd ggg ggr ggz gra grc grd gre grg grr gza gzr ra- raa rac rad rae rag rar raz rca rcc rcd rce rcg rcr rda rdc rdd rde rdg rdr re- rea rec red ree reg rer rez rga rgc rgd rge rgg rgr rra rrc rrd rrg rrr rza rze z-g zaa zac zad zag zar zaz zce zea zec zed zee zer zez zgg zzr zzz