-er a-a a-c aaa aac aae aam aap aar ac- aca acc ace acm acp acr aea aec aee aem aep aer ama amc ame amm amp amr ap- apa apc ape apm app apr ar- ara arc are arm arp arr c-- caa cac cae cam cap car cca ccc cce ccm ccp ccr ce- cea cec cee cem cep cer cma cmc cme cmm cmp cmr cpa cpc cpe cpm cpp cpr cra crc cre crm crp crr eaa eac eae eam eap ear ec- eca ecc ece ecm ecr eea eec eee eem eep eer em- ema emc eme emm emp emr ep- epa epc epe epm epp epr era erc ere erm erp err m-r maa mac mae mam map mar mc- mca mcc mce mcm mcp mcr mea mec mee mem mep mer mma mmc mme mmm mmp mmr mpa mpc mpe mpm mpp mpr mra mrc mre mrm mrp mrr p-p paa pac pae pam pap par pca pcc pce pcm pcp pcr pea pec pee pem pep per pma pmc pme pmm pmp pmr ppa ppc ppe ppm ppp ppr pra prc pre prm prp prr ra- raa rac rae ram rap rar rca rcc rce rcm rcp rcr re- rea rec ree rem rep rer rma rmc rme rmm rmp rmr rpa rpc rpe rpm rpp rpr rra rrc rrm rrp rrr