a-a a-c aaa aac aaf aan aao aay ac- aca acc acf acn aco acy af- afa afc aff afn afo afy an- ana anc anf ann ano any aoa aoc aof aon aoo ay- aya ayc ayf ayn ayo c-- caa cac caf can cao cay cca ccc ccf ccn cco cfa cfc cff cfn cfo cn- cna cnc cnf cnn cno cny co- coa coc cof con coo coy cya cyc cyf cyn cyo faa fac faf fan fao fay fca fcc fcf fcn fco fcy ffa ffc fff ffn ffo ffy fna fnc fnf fnn foa foc fof fon foo foy fy- fya fyc fyn fyo naa nac naf nan nao nay nca ncc ncf ncn nco nfa nfc nff nfn nfo nna nnc nnf nnn nno no- noa noc nof non noo noy nya nyc nyf nyn nyo nyy oaa oac oaf oan oao oc- oca occ ocf ocn oco of- ofa ofc off ofn ofo on- ona onc onf onn ono ony oo- ooa ooc oof oon ooo oya oyo yaa yac yaf yan yao yay yca ycc ycf yco ycy yfa yfc yff yna ynn yny yoc yof yon yoo yoy yyc yyf yyy