a-a a-c aaa aac aae aaf aan aao ac- aca acc ace acf acn aco aea aec aee aef aen aeo af- afa afc afe aff afn afo an- ana anc ane anf ann ano aoa aoc aoe aof aon aoo c-- caa cac cae caf can cao cca ccc cce ccf ccn cco ce- cea cec cee cef cen ceo cfa cfc cfe cff cfn cfo cn- cna cnc cne cnf cnn cno co- coa coc coe cof con coo eaa eac eae eaf ean eao ec- eca ecc ece ecf ecn eco eea eec eee eef een eeo ef- efa efc efe eff efo en- ena enc ene enf enn eno eo- eoa eoc eoe eof eon eoo faa fac fae faf fan fao fca fcc fce fcf fcn fco fea fec fee fef fen feo ffa ffc ffe fff ffn ffo fna fnc fne fnf fnn foa foc foe fof fon foo naa nac nae naf nan nao nca ncc nce ncf ncn nco ne- nea nec nee nef nen neo nfa nfc nfe nff nfn nfo nna nnc nne nnf nnn nno no- noa noc noe nof non noo oaa oac oae oaf oan oao oc- oca occ ocf ocn oco oea oec oee oef oen oeo of- ofa ofc ofe off ofn ofo on- ona onc one onf onn ono oo- ooa ooc oof oon ooo