-er a-a a-c aaa aac aae aak aam aap aar ac- aca acc ace ack acm acp acr aea aec aee aek aem aep aer aka akc ake akk akm akp akr ama amc ame amk amm amp amr ap- apa apc ape apk apm app apr ar- ara arc are ark arm arp arr c-- caa cac cae cak cam cap car cca ccc cce cck ccm ccp ccr ce- cea cec cee cek cem cep cer cka ckc ckm cma cmc cme cmk cmm cmp cmr cpa cpc cpe cpk cpm cpp cpr cra crc cre crk crm crp crr eaa eac eae eak eam eap ear ec- eca ecc ece eck ecm ecr eea eec eee eek eem eep eer eka ekc eke ekp ekr em- ema emc eme emk emm emp emr ep- epa epc epe epm epp epr era erc ere erk erm erp err ka- kaa kac kae kak kam kap kar kca kcc kce kck kcm kcp kcr ke- kea kec kee kek kem kep ker kkc kke kkk kkm kkp kkr kma kmc kme kmk kmm kmp kpa kpc kpe kpk kpm kpp kpr kra krc krk krp krr m-r maa mac mae mak mam map mar mc- mca mcc mce mck mcm mcp mcr mea mec mee mek mem mep mer mka mkc mke mkk mkm mkp mkr mma mmc mme mmk mmm mmp mmr mpa mpc mpe mpk mpm mpp mpr mra mrc mre mrk mrm mrp mrr p-p paa pac pae pak pam pap par pca pcc pce pck pcm pcp pcr pea pec pee pek pem pep per pka pkc pke pkm pkp pkr pma pmc pme pmk pmm pmp pmr ppa ppc ppe ppk ppm ppp ppr pra prc pre prk prm prp prr ra- raa rac rae rak ram rap rar rca rcc rce rcm rcp rcr re- rea rec ree rek rem rep rer rkc rke rkk rkm rkp rma rmc rme rmm rmp rmr rpa rpc rpe rpk rpm rpp rpr rra rrc rrk rrm rrp rrr