-er a-a a-c aaa aac aae aag aaj aak aar ac- aca acc ace acg acj ack acr aea aec aee aeg aej aek aer ag- aga agc age agg agj agk agr aja ajc aje ajj ajk ajr aka akc ake akg akj akk akr ar- ara arc are arg arj ark arr c-- c-j caa cac cae cag caj cak car cca ccc cce ccg ccj cck ccr ce- cea cec cee ceg cej cek cer cga cgc cge cgg cgr cja cjc cjg cjk cjr cka ckc cra crc cre crg crj crk crr eaa eac eae eag eaj eak ear ec- eca ecc ece ecg ecj eck ecr eea eec eee eeg eek eer ega egc ege egg egr eja ejc eka ekc eke ekg ekr era erc ere erg erk err gaa gac gae gag gaj gak gar gca gcc gce gcg gck gcr ge- gea gec gee geg gek ger gga ggc ggg ggj ggr gja gjc gje gjg gjr gka gra grc gre grg grj grk grr jaa jac jae jag jaj jak jar jca jcc jce jck jcr jea jec jee jeg jej jek jer jga jge jgr jja jjc jjg jjj jjk jjr jka jkk jkr jra jrc jrg jrk jrr ka- kaa kac kae kag kaj kak kar kca kcc kce kcg kck kcr ke- kea kec kee keg kek ker kga kgc kjc kje kjr kkc kke kkk kkr kra krc krg krk krr ra- raa rac rae rag raj rak rar rca rcc rce rcg rcj rcr re- rea rec ree reg rek rer rga rgc rge rgg rgk rgr rja rjc rjg rjk rjr rkc rke rkg rkk rra rrc rrg rrk rrr