-er a-a a-c aaa aac aae aaf aan aao aar ac- aca acc ace acf acn aco acr aea aec aee aef aen aeo aer af- afa afc afe aff afn afo afr an- ana anc ane anf ann ano anr aoa aoc aoe aof aon aoo aor ar- ara arc are arf arn aro arr c-- caa cac cae caf can cao car cca ccc cce ccf ccn cco ccr ce- cea cec cee cef cen ceo cer cfa cfc cfe cff cfn cfo cfr cn- cna cnc cne cnf cnn cno cnr co- coa coc coe cof con coo cor cra crc cre crf crn cro crr eaa eac eae eaf ean eao ear ec- eca ecc ece ecf ecn eco ecr eea eec eee eef een eeo eer ef- efa efc efe eff efo efr en- ena enc ene enf enn eno enr eo- eoa eoc eoe eof eon eoo eor era erc ere erf ern ero err faa fac fae faf fan fao far fca fcc fce fcf fcn fco fcr fea fec fee fef fen feo fer ffa ffc ffe fff ffn ffo ffr fna fnc fne fnf fnn fnr foa foc foe fof fon foo for fra frc fre frf frn fro frr naa nac nae naf nan nao nar nca ncc nce ncf ncn nco ncr ne- nea nec nee nef nen neo ner nfa nfc nfe nff nfn nfo nfr nna nnc nne nnf nnn nno no- noa noc noe nof non noo nor nra nrc nre nrf nrn nro nrr oaa oac oae oaf oan oao oar oc- oca occ ocf ocn oco ocr oea oec oee oef oen oeo oer of- ofa ofc ofe off ofn ofo ofr on- ona onc one onf onn ono onr oo- ooa ooc oof oon ooo oor or- ora orc ore orf orn oro orr ra- raa rac rae raf ran rao rar rca rcc rce rcf rcn rco rcr re- rea rec ree ref ren reo rer rfa rfc rfe rff rfn rfo rfr rna rnc rnn rno rnr roa roc roe rof ron roo ror rra rrc rrf rrn rrr