-er a-a a-c aaa aac aae aaj aak aar ac- aca acc ace acj ack acr aea aec aee aej aek aer aja ajc aje ajj ajk ajr aka akc ake akj akk akr ar- ara arc are arj ark arr c-- c-j caa cac cae caj cak car cca ccc cce ccj cck ccr ce- cea cec cee cej cek cer cja cjc cjk cjr cka ckc cra crc cre crj crk crr eaa eac eae eaj eak ear ec- eca ecc ece ecj eck ecr eea eec eee eek eer eja ejc eka ekc eke ekr era erc ere erk err jaa jac jae jaj jak jar jca jcc jce jck jcr jea jec jee jej jek jer jja jjc jjj jjk jjr jka jkk jkr jra jrc jrk jrr ka- kaa kac kae kaj kak kar kca kcc kce kck kcr ke- kea kec kee kek ker kjc kje kjr kkc kke kkk kkr kra krc krk krr ra- raa rac rae raj rak rar rca rcc rce rcj rcr re- rea rec ree rek rer rja rjc rjk rjr rkc rke rkk rra rrc rrk rrr