-er a-a a-c aaa aac aae aag aaj aao aar ac- aca acc ace acg acj aco acr aea aec aee aeg aej aeo aer ag- aga agc age agg agj ago agr aja ajc aje ajj ajo ajr aoa aoc aoe aog aoj aoo aor ar- ara arc are arg arj aro arr c-- c-j caa cac cae cag caj cao car cca ccc cce ccg ccj cco ccr ce- cea cec cee ceg cej ceo cer cga cgc cge cgg cgo cgr cja cjc cjg cjr co- coa coc coe cog coj coo cor cra crc cre crg crj cro crr eaa eac eae eag eaj eao ear ec- eca ecc ece ecg ecj eco ecr eea eec eee eeg eeo eer ega egc ege egg ego egr eja ejc ejo eo- eoa eoc eoe eog eoo eor era erc ere erg ero err gaa gac gae gag gaj gao gar gca gcc gce gcg gco gcr ge- gea gec gee geg geo ger gga ggc ggg ggj ggo ggr gja gjc gje gjg gjr goa goc goe gog goo gor gra grc gre grg grj gro grr jaa jac jae jag jaj jao jar jca jcc jce jco jcr jea jec jee jeg jej jeo jer jga jge jgo jgr jja jjc jjg jjj jjr joa joc joe jog joj joo jor jra jrc jrg jro jrr oaa oac oae oag oaj oao oar oc- oca occ ocg ocj oco ocr oea oec oee oeg oeo oer oga ogc oge ogg ogo oja ojc oje ojo oo- ooa ooc oog ooo oor or- ora orc ore org oro orr ra- raa rac rae rag raj rao rar rca rcc rce rcg rcj rco rcr re- rea rec ree reg reo rer rga rgc rge rgg rgo rgr rja rjc rjg rjr roa roc roe rog roj roo ror rra rrc rrg rrr