a-a a-c aaa aac aaf aan aau ac- aca acc acf acn acu af- afa afc aff afn afu an- ana anc anf ann anu au- aua auc auf aun c-- caa cac caf can cau cca ccc ccf ccn ccu cfa cfc cff cfn cfu cn- cna cnc cnf cnn cnu cua cuc cuf cun cuu faa fac faf fan fau fca fcc fcf fcn fcu ffa ffc fff ffn ffu fna fnc fnf fnn fnu fua fuf fun fuu naa nac naf nan nau nca ncc ncf ncn ncu nfa nfc nff nfn nfu nna nnc nnf nnn nnu nua nuc nun nuu ua- uaa uac uaf uan uau uca ucc ucf ucn ucu ufa ufc uff ufn ufu un- una unc unf unn unu uua uuc uun uuu