a-a aaa aaf aaj aan aao af- afa aff afj afn afo aja ajf ajj ajn ajo an- ana anf anj ann ano aoa aof aoj aon aoo faa faf faj fan fao ffa fff ffn ffo fja fna fnf fnj fnn foa fof fon foo jaa jaf jaj jan jao jfa jff jfj jfo jja jjf jjj jna jnf jnj jnn jno joa jof joj jon joo naa naf naj nan nao nfa nff nfn nfo nja njf njn nna nnf nnn nno no- noa nof noj non noo oaa oaf oaj oan oao of- ofa off ofn ofo oja ojo on- ona onf onj onn ono oo- ooa oof oon ooo