-er a-a a-c aaa aac aae aam aan aap aar ac- aca acc ace acm acn acp acr aea aec aee aem aen aep aer ama amc ame amm amn amp amr an- ana anc ane anm ann anp anr ap- apa apc ape apm apn app apr ar- ara arc are arm arn arp arr c-- caa cac cae cam can cap car cca ccc cce ccm ccn ccp ccr ce- cea cec cee cem cen cep cer cma cmc cme cmm cmn cmp cmr cn- cna cnc cne cnm cnn cnp cnr cpa cpc cpe cpm cpn cpp cpr cra crc cre crm crn crp crr eaa eac eae eam ean eap ear ec- eca ecc ece ecm ecn ecr eea eec eee eem een eep eer em- ema emc eme emm emn emp emr en- ena enc ene enm enn enp enr ep- epa epc epe epm epn epp epr era erc ere erm ern erp err m-r maa mac mae mam man map mar mc- mca mcc mce mcm mcn mcp mcr mea mec mee mem men mep mer mma mmc mme mmm mmn mmp mmr mna mnc mne mnm mnn mnp mnr mpa mpc mpe mpm mpn mpp mpr mra mrc mre mrm mrn mrp mrr naa nac nae nam nan nap nar nca ncc nce ncm ncn ncp ncr ne- nea nec nee nem nen nep ner nma nmc nme nmm nmn nmp nmr nna nnc nne nnm nnn nnp npa npc npe npm npn npp npr nra nrc nre nrm nrn nrp nrr p-p paa pac pae pam pan pap par pca pcc pce pcm pcn pcp pcr pea pec pee pem pen pep per pma pmc pme pmm pmn pmp pmr pn- pna pnc pne pnm pnn pnp pnr ppa ppc ppe ppm ppn ppp ppr pra prc pre prm prn prp prr ra- raa rac rae ram ran rap rar rca rcc rce rcm rcn rcp rcr re- rea rec ree rem ren rep rer rma rmc rme rmm rmn rmp rmr rna rnc rnm rnn rnp rnr rpa rpc rpe rpm rpn rpp rpr rra rrc rrm rrn rrp rrr