-er a-a a-c aaa aac aae aam aap aar aas ac- aca acc ace acm acp acr acs aea aec aee aem aep aer aes ama amc ame amm amp amr ams ap- apa apc ape apm app apr aps ar- ara arc are arm arp arr ars as- asa asc ase asm asp asr ass c-- caa cac cae cam cap car cas cca ccc cce ccm ccp ccr ccs ce- cea cec cee cem cep cer ces cma cmc cme cmm cmp cmr cms cpa cpc cpe cpm cpp cpr cps cra crc cre crm crp crr crs csa csc cse csm csp csr css eaa eac eae eam eap ear eas ec- eca ecc ece ecm ecr ecs eea eec eee eem eep eer ees em- ema emc eme emm emp emr ems ep- epa epc epe epm epp epr eps era erc ere erm erp err ers es- esa esc ese esm esp esr ess m-r maa mac mae mam map mar mas mc- mca mcc mce mcm mcp mcr mcs mea mec mee mem mep mer mes mma mmc mme mmm mmp mmr mms mpa mpc mpe mpm mpp mpr mps mra mrc mre mrm mrp mrr mrs msa msc mse msm msp msr mss p-p paa pac pae pam pap par pas pca pcc pce pcm pcp pcr pcs pea pec pee pem pep per pes pma pmc pme pmm pmp pmr pms ppa ppc ppe ppm ppp ppr pps pra prc pre prm prp prr prs ps- psa psc pse psm psp psr pss ra- raa rac rae ram rap rar ras rca rcc rce rcm rcp rcr rcs re- rea rec ree rem rep rer res rma rmc rme rmm rmp rmr rms rpa rpc rpe rpm rpp rpr rps rra rrc rrm rrp rrr rrs rsa rsc rse rsm rsp rsr rss saa sac sae sam sap sar sas sca scc sce scm scp scr scs se- sea sec see sem sep ser ses sma smc sme smm smp smr sms spa spc spe spm spp spr sps sr- sra src sre srm srp srr srs ss- ssa ssc sse ssm ssp ssr sss