-er a-a a-c aaa aac aae aaj aak aan aar ac- aca acc ace acj ack acn acr aea aec aee aej aek aen aer aja ajc aje ajj ajk ajn ajr aka akc ake akj akk akn akr an- ana anc ane anj ank ann anr ar- ara arc are arj ark arn arr c-- c-j caa cac cae caj cak can car cca ccc cce ccj cck ccn ccr ce- cea cec cee cej cek cen cer cja cjc cjk cjr cka ckc cn- cna cnc cne cnj cnn cnr cra crc cre crj crk crn crr eaa eac eae eaj eak ean ear ec- eca ecc ece ecj eck ecn ecr eea eec eee eek een eer eja ejc eka ekc eke ekr en- ena enc ene enk enn enr era erc ere erk ern err jaa jac jae jaj jak jan jar jca jcc jce jck jcr jea jec jee jej jek jen jer jja jjc jjj jjk jjr jka jkk jkn jkr jna jnc jne jnj jnn jnr jra jrc jrk jrn jrr ka- kaa kac kae kaj kak kan kar kca kcc kce kck kcn kcr ke- kea kec kee kek ken ker kjc kje kjr kkc kke kkk kkn kkr kn- kna knc kne knk knn knr kra krc krk krn krr naa nac nae naj nak nan nar nca ncc nce nck ncn ncr ne- nea nec nee nej nek nen ner nja njc nje njk njn nka nkc nke nkj nkk nkn nkr nna nnc nne nnk nnn nra nrc nre nrj nrk nrn nrr ra- raa rac rae raj rak ran rar rca rcc rce rcj rcn rcr re- rea rec ree rek ren rer rja rjc rjk rjr rkc rke rkk rna rnc rnn rnr rra rrc rrk rrn rrr