-er a-a a-c aaa aac aae aaf aam aan aao aar ac- aca acc ace acf acm acn aco acr aea aec aee aef aem aen aeo aer af- afa afc afe aff afm afn afo afr ama amc ame amf amm amn amo amr an- ana anc ane anf anm ann ano anr aoa aoc aoe aof aom aon aoo aor ar- ara arc are arf arm arn aro arr c-- caa cac cae caf cam can cao car cca ccc cce ccf ccm ccn cco ccr ce- cea cec cee cef cem cen ceo cer cfa cfc cfe cff cfm cfn cfo cfr cma cmc cme cmf cmm cmn cmo cmr cn- cna cnc cne cnf cnm cnn cno cnr co- coa coc coe cof com con coo cor cra crc cre crf crm crn cro crr eaa eac eae eaf eam ean eao ear ec- eca ecc ece ecf ecm ecn eco ecr eea eec eee eef eem een eeo eer ef- efa efc efe eff efm efo efr em- ema emc eme emf emm emn emo emr en- ena enc ene enf enm enn eno enr eo- eoa eoc eoe eof eom eon eoo eor era erc ere erf erm ern ero err faa fac fae faf fam fan fao far fca fcc fce fcf fcm fcn fco fcr fea fec fee fef fem fen feo fer ffa ffc ffe fff ffm ffn ffo ffr fma fmc fme fmf fmm fmn fmo fmr fna fnc fne fnf fnm fnn fnr foa foc foe fof fom fon foo for fra frc fre frf frm frn fro frr m-f m-o m-r maa mac mae maf mam man mao mar mc- mca mcc mce mcf mcm mcn mco mcr mea mec mee mef mem men meo mer mfa mfc mfe mff mfm mfn mfo mfr mma mmc mme mmf mmm mmn mmo mmr mna mnc mne mnf mnm mnn mno mnr moa moc moe mof mom mon moo mor mra mrc mre mrf mrm mrn mro mrr naa nac nae naf nam nan nao nar nca ncc nce ncf ncm ncn nco ncr ne- nea nec nee nef nem nen neo ner nfa nfc nfe nff nfn nfo nfr nma nmc nme nmm nmn nmo nmr nna nnc nne nnf nnm nnn nno no- noa noc noe nof nom non noo nor nra nrc nre nrf nrm nrn nro nrr oaa oac oae oaf oam oan oao oar oc- oca occ ocf ocm ocn oco ocr oea oec oee oef oem oen oeo oer of- ofa ofc ofe off ofm ofn ofo ofr om- oma omc ome omf omm omn omo omr on- ona onc one onf onn ono onr oo- ooa ooc oof oom oon ooo oor or- ora orc ore orf orm orn oro orr ra- raa rac rae raf ram ran rao rar rca rcc rce rcf rcm rcn rco rcr re- rea rec ree ref rem ren reo rer rfa rfc rfe rff rfm rfn rfo rfr rma rmc rme rmf rmm rmn rmo rmr rna rnc rnm rnn rno rnr roa roc roe rof rom ron roo ror rra rrc rrf rrm rrn rrr