-er a-a a-c aaa aac aae aaf aan aao aap aar ac- aca acc ace acf acn aco acp acr aea aec aee aef aen aeo aep aer af- afa afc afe aff afn afo afp afr an- ana anc ane anf ann ano anp anr aoa aoc aoe aof aon aoo aop aor ap- apa apc ape apf apn apo app apr ar- ara arc are arf arn aro arp arr c-- caa cac cae caf can cao cap car cca ccc cce ccf ccn cco ccp ccr ce- cea cec cee cef cen ceo cep cer cfa cfc cfe cff cfn cfo cfp cfr cn- cna cnc cne cnf cnn cno cnp cnr co- coa coc coe cof con coo cop cor cpa cpc cpe cpf cpn cpo cpp cpr cra crc cre crf crn cro crp crr eaa eac eae eaf ean eao eap ear ec- eca ecc ece ecf ecn eco ecr eea eec eee eef een eeo eep eer ef- efa efc efe eff efo efp efr en- ena enc ene enf enn eno enp enr eo- eoa eoc eoe eof eon eoo eop eor ep- epa epc epe epf epn epo epp epr era erc ere erf ern ero erp err faa fac fae faf fan fao fap far fca fcc fce fcf fcn fco fcp fcr fea fec fee fef fen feo fep fer ffa ffc ffe fff ffn ffo ffp ffr fna fnc fne fnf fnn fnp fnr foa foc foe fof fon foo fop for fpa fpc fpe fpn fpo fpp fpr fra frc fre frf frn fro frp frr naa nac nae naf nan nao nap nar nca ncc nce ncf ncn nco ncp ncr ne- nea nec nee nef nen neo nep ner nfa nfc nfe nff nfn nfo nfp nfr nna nnc nne nnf nnn nno nnp no- noa noc noe nof non noo nop nor npa npc npe npf npn npo npp npr nra nrc nre nrf nrn nro nrp nrr oaa oac oae oaf oan oao oap oar oc- oca occ ocf ocn oco ocp ocr oea oec oee oef oen oeo oep oer of- ofa ofc ofe off ofn ofo ofp ofr on- ona onc one onf onn ono onp onr oo- ooa ooc oof oon ooo oop oor op- opa opc ope opf opn opo opp opr or- ora orc ore orf orn oro orp orr p-p paa pac pae paf pan pao pap par pca pcc pce pcf pcn pco pcp pcr pea pec pee pef pen peo pep per pfa pfc pfe pff pfn pfo pfp pfr pn- pna pnc pne pnf pnn pno pnp pnr poa poc poe pof pon poo pop por ppa ppc ppe ppf ppn ppo ppp ppr pra prc pre prf prn pro prp prr ra- raa rac rae raf ran rao rap rar rca rcc rce rcf rcn rco rcp rcr re- rea rec ree ref ren reo rep rer rfa rfc rfe rff rfn rfo rfp rfr rna rnc rnn rno rnp rnr roa roc roe rof ron roo rop ror rpa rpc rpe rpf rpn rpo rpp rpr rra rrc rrf rrn rrp rrr