-er a-a a-c aaa aac aae aaf aam aap aar ac- aca acc ace acf acm acp acr aea aec aee aef aem aep aer af- afa afc afe aff afm afp afr ama amc ame amf amm amp amr ap- apa apc ape apf apm app apr ar- ara arc are arf arm arp arr c-- caa cac cae caf cam cap car cca ccc cce ccf ccm ccp ccr ce- cea cec cee cef cem cep cer cfa cfc cfe cff cfm cfp cfr cma cmc cme cmf cmm cmp cmr cpa cpc cpe cpf cpm cpp cpr cra crc cre crf crm crp crr eaa eac eae eaf eam eap ear ec- eca ecc ece ecf ecm ecr eea eec eee eef eem eep eer ef- efa efc efe eff efm efp efr em- ema emc eme emf emm emp emr ep- epa epc epe epf epm epp epr era erc ere erf erm erp err faa fac fae faf fam fap far fca fcc fce fcf fcm fcp fcr fea fec fee fef fem fep fer ffa ffc ffe fff ffm ffp ffr fma fmc fme fmf fmm fmp fmr fpa fpc fpe fpm fpp fpr fra frc fre frf frm frp frr m-f m-r maa mac mae maf mam map mar mc- mca mcc mce mcf mcm mcp mcr mea mec mee mef mem mep mer mfa mfc mfe mff mfm mfp mfr mma mmc mme mmf mmm mmp mmr mpa mpc mpe mpf mpm mpp mpr mra mrc mre mrf mrm mrp mrr p-p paa pac pae paf pam pap par pca pcc pce pcf pcm pcp pcr pea pec pee pef pem pep per pfa pfc pfe pff pfm pfp pfr pma pmc pme pmf pmm pmp pmr ppa ppc ppe ppf ppm ppp ppr pra prc pre prf prm prp prr ra- raa rac rae raf ram rap rar rca rcc rce rcf rcm rcp rcr re- rea rec ree ref rem rep rer rfa rfc rfe rff rfm rfp rfr rma rmc rme rmf rmm rmp rmr rpa rpc rpe rpf rpm rpp rpr rra rrc rrf rrm rrp rrr