a-a a-c aaa aac aaf aan aay ac- aca acc acf acn acy af- afa afc aff afn afy an- ana anc anf ann any ay- aya ayc ayf ayn c-- caa cac caf can cay cca ccc ccf ccn cfa cfc cff cfn cn- cna cnc cnf cnn cny cya cyc cyf cyn faa fac faf fan fay fca fcc fcf fcn fcy ffa ffc fff ffn ffy fna fnc fnf fnn fy- fya fyc fyn naa nac naf nan nay nca ncc ncf ncn nfa nfc nff nfn nna nnc nnf nnn nya nyc nyf nyn nyy yaa yac yaf yan yay yca ycc ycf ycy yfa yfc yff yna ynn yny yyc yyf yyy