-er a-a a-c aaa aac aae aaf aam aan aao aap aar ac- aca acc ace acf acm acn aco acp acr aea aec aee aef aem aen aeo aep aer af- afa afc afe aff afm afn afo afp afr ama amc ame amf amm amn amo amp amr an- ana anc ane anf anm ann ano anp anr aoa aoc aoe aof aom aon aoo aop aor ap- apa apc ape apf apm apn apo app apr ar- ara arc are arf arm arn aro arp arr c-- caa cac cae caf cam can cao cap car cca ccc cce ccf ccm ccn cco ccp ccr ce- cea cec cee cef cem cen ceo cep cer cfa cfc cfe cff cfm cfn cfo cfp cfr cma cmc cme cmf cmm cmn cmo cmp cmr cn- cna cnc cne cnf cnm cnn cno cnp cnr co- coa coc coe cof com con coo cop cor cpa cpc cpe cpf cpm cpn cpo cpp cpr cra crc cre crf crm crn cro crp crr eaa eac eae eaf eam ean eao eap ear ec- eca ecc ece ecf ecm ecn eco ecr eea eec eee eef eem een eeo eep eer ef- efa efc efe eff efm efo efp efr em- ema emc eme emf emm emn emo emp emr en- ena enc ene enf enm enn eno enp enr eo- eoa eoc eoe eof eom eon eoo eop eor ep- epa epc epe epf epm epn epo epp epr era erc ere erf erm ern ero erp err faa fac fae faf fam fan fao fap far fca fcc fce fcf fcm fcn fco fcp fcr fea fec fee fef fem fen feo fep fer ffa ffc ffe fff ffm ffn ffo ffp ffr fma fmc fme fmf fmm fmn fmo fmp fmr fna fnc fne fnf fnm fnn fnp fnr foa foc foe fof fom fon foo fop for fpa fpc fpe fpm fpn fpo fpp fpr fra frc fre frf frm frn fro frp frr m-f m-o m-r maa mac mae maf mam man mao map mar mc- mca mcc mce mcf mcm mcn mco mcp mcr mea mec mee mef mem men meo mep mer mfa mfc mfe mff mfm mfn mfo mfp mfr mma mmc mme mmf mmm mmn mmo mmp mmr mna mnc mne mnf mnm mnn mno mnp mnr moa moc moe mof mom mon moo mop mor mpa mpc mpe mpf mpm mpn mpo mpp mpr mra mrc mre mrf mrm mrn mro mrp mrr naa nac nae naf nam nan nao nap nar nca ncc nce ncf ncm ncn nco ncp ncr ne- nea nec nee nef nem nen neo nep ner nfa nfc nfe nff nfn nfo nfp nfr nma nmc nme nmm nmn nmo nmp nmr nna nnc nne nnf nnm nnn nno nnp no- noa noc noe nof nom non noo nop nor npa npc npe npf npm npn npo npp npr nra nrc nre nrf nrm nrn nro nrp nrr oaa oac oae oaf oam oan oao oap oar oc- oca occ ocf ocm ocn oco ocp ocr oea oec oee oef oem oen oeo oep oer of- ofa ofc ofe off ofm ofn ofo ofp ofr om- oma omc ome omf omm omn omo omp omr on- ona onc one onf onn ono onp onr oo- ooa ooc oof oom oon ooo oop oor op- opa opc ope opf opm opn opo opp opr or- ora orc ore orf orm orn oro orp orr p-p paa pac pae paf pam pan pao pap par pca pcc pce pcf pcm pcn pco pcp pcr pea pec pee pef pem pen peo pep per pfa pfc pfe pff pfm pfn pfo pfp pfr pma pmc pme pmf pmm pmn pmo pmp pmr pn- pna pnc pne pnf pnm pnn pno pnp pnr poa poc poe pof pom pon poo pop por ppa ppc ppe ppf ppm ppn ppo ppp ppr pra prc pre prf prm prn pro prp prr ra- raa rac rae raf ram ran rao rap rar rca rcc rce rcf rcm rcn rco rcp rcr re- rea rec ree ref rem ren reo rep rer rfa rfc rfe rff rfm rfn rfo rfp rfr rma rmc rme rmf rmm rmn rmo rmp rmr rna rnc rnm rnn rno rnp rnr roa roc roe rof rom ron roo rop ror rpa rpc rpe rpf rpm rpn rpo rpp rpr rra rrc rrf rrm rrn rrp rrr