-er a-a a-c aaa aac aae aam aan aao aap aar ac- aca acc ace acm acn aco acp acr aea aec aee aem aen aeo aep aer ama amc ame amm amn amo amp amr an- ana anc ane anm ann ano anp anr aoa aoc aoe aom aon aoo aop aor ap- apa apc ape apm apn apo app apr ar- ara arc are arm arn aro arp arr c-- caa cac cae cam can cao cap car cca ccc cce ccm ccn cco ccp ccr ce- cea cec cee cem cen ceo cep cer cma cmc cme cmm cmn cmo cmp cmr cn- cna cnc cne cnm cnn cno cnp cnr co- coa coc coe com con coo cop cor cpa cpc cpe cpm cpn cpo cpp cpr cra crc cre crm crn cro crp crr eaa eac eae eam ean eao eap ear ec- eca ecc ece ecm ecn eco ecr eea eec eee eem een eeo eep eer em- ema emc eme emm emn emo emp emr en- ena enc ene enm enn eno enp enr eo- eoa eoc eoe eom eon eoo eop eor ep- epa epc epe epm epn epo epp epr era erc ere erm ern ero erp err m-o m-r maa mac mae mam man mao map mar mc- mca mcc mce mcm mcn mco mcp mcr mea mec mee mem men meo mep mer mma mmc mme mmm mmn mmo mmp mmr mna mnc mne mnm mnn mno mnp mnr moa moc moe mom mon moo mop mor mpa mpc mpe mpm mpn mpo mpp mpr mra mrc mre mrm mrn mro mrp mrr naa nac nae nam nan nao nap nar nca ncc nce ncm ncn nco ncp ncr ne- nea nec nee nem nen neo nep ner nma nmc nme nmm nmn nmo nmp nmr nna nnc nne nnm nnn nno nnp no- noa noc noe nom non noo nop nor npa npc npe npm npn npo npp npr nra nrc nre nrm nrn nro nrp nrr oaa oac oae oam oan oao oap oar oc- oca occ ocm ocn oco ocp ocr oea oec oee oem oen oeo oep oer om- oma omc ome omm omn omo omp omr on- ona onc one onn ono onp onr oo- ooa ooc oom oon ooo oop oor op- opa opc ope opm opn opo opp opr or- ora orc ore orm orn oro orp orr p-p paa pac pae pam pan pao pap par pca pcc pce pcm pcn pco pcp pcr pea pec pee pem pen peo pep per pma pmc pme pmm pmn pmo pmp pmr pn- pna pnc pne pnm pnn pno pnp pnr poa poc poe pom pon poo pop por ppa ppc ppe ppm ppn ppo ppp ppr pra prc pre prm prn pro prp prr ra- raa rac rae ram ran rao rap rar rca rcc rce rcm rcn rco rcp rcr re- rea rec ree rem ren reo rep rer rma rmc rme rmm rmn rmo rmp rmr rna rnc rnm rnn rno rnp rnr roa roc roe rom ron roo rop ror rpa rpc rpe rpm rpn rpo rpp rpr rra rrc rrm rrn rrp rrr