a-a a-c aaa aac aae aaf aan aao aap ac- aca acc ace acf acn aco acp aea aec aee aef aen aeo aep af- afa afc afe aff afn afo afp an- ana anc ane anf ann ano anp aoa aoc aoe aof aon aoo aop ap- apa apc ape apf apn apo app c-- caa cac cae caf can cao cap cca ccc cce ccf ccn cco ccp ce- cea cec cee cef cen ceo cep cfa cfc cfe cff cfn cfo cfp cn- cna cnc cne cnf cnn cno cnp co- coa coc coe cof con coo cop cpa cpc cpe cpf cpn cpo cpp eaa eac eae eaf ean eao eap ec- eca ecc ece ecf ecn eco eea eec eee eef een eeo eep ef- efa efc efe eff efo efp en- ena enc ene enf enn eno enp eo- eoa eoc eoe eof eon eoo eop ep- epa epc epe epf epn epo epp faa fac fae faf fan fao fap fca fcc fce fcf fcn fco fcp fea fec fee fef fen feo fep ffa ffc ffe fff ffn ffo ffp fna fnc fne fnf fnn fnp foa foc foe fof fon foo fop fpa fpc fpe fpn fpo fpp naa nac nae naf nan nao nap nca ncc nce ncf ncn nco ncp ne- nea nec nee nef nen neo nep nfa nfc nfe nff nfn nfo nfp nna nnc nne nnf nnn nno nnp no- noa noc noe nof non noo nop npa npc npe npf npn npo npp oaa oac oae oaf oan oao oap oc- oca occ ocf ocn oco ocp oea oec oee oef oen oeo oep of- ofa ofc ofe off ofn ofo ofp on- ona onc one onf onn ono onp oo- ooa ooc oof oon ooo oop op- opa opc ope opf opn opo opp p-p paa pac pae paf pan pao pap pca pcc pce pcf pcn pco pcp pea pec pee pef pen peo pep pfa pfc pfe pff pfn pfo pfp pn- pna pnc pne pnf pnn pno pnp poa poc poe pof pon poo pop ppa ppc ppe ppf ppn ppo ppp