-er a-a a-c aaa aac aae aak aam aan aar ac- aca acc ace ack acm acn acr aea aec aee aek aem aen aer aka akc ake akk akm akn akr ama amc ame amk amm amn amr an- ana anc ane ank anm ann anr ar- ara arc are ark arm arn arr c-- caa cac cae cak cam can car cca ccc cce cck ccm ccn ccr ce- cea cec cee cek cem cen cer cka ckc ckm cma cmc cme cmk cmm cmn cmr cn- cna cnc cne cnm cnn cnr cra crc cre crk crm crn crr eaa eac eae eak eam ean ear ec- eca ecc ece eck ecm ecn ecr eea eec eee eek eem een eer eka ekc eke ekr em- ema emc eme emk emm emn emr en- ena enc ene enk enm enn enr era erc ere erk erm ern err ka- kaa kac kae kak kam kan kar kca kcc kce kck kcm kcn kcr ke- kea kec kee kek kem ken ker kkc kke kkk kkm kkn kkr kma kmc kme kmk kmm kn- kna knc kne knk knm knn knr kra krc krk krn krr m-r maa mac mae mak mam man mar mc- mca mcc mce mck mcm mcn mcr mea mec mee mek mem men mer mka mkc mke mkk mkm mkn mkr mma mmc mme mmk mmm mmn mmr mna mnc mne mnk mnm mnn mnr mra mrc mre mrk mrm mrn mrr naa nac nae nak nam nan nar nca ncc nce nck ncm ncn ncr ne- nea nec nee nek nem nen ner nka nkc nke nkk nkm nkn nkr nma nmc nme nmk nmm nmn nmr nna nnc nne nnk nnm nnn nra nrc nre nrk nrm nrn nrr ra- raa rac rae rak ram ran rar rca rcc rce rcm rcn rcr re- rea rec ree rek rem ren rer rkc rke rkk rkm rma rmc rme rmm rmn rmr rna rnc rnm rnn rnr rra rrc rrk rrm rrn rrr