a-a a-t aaa aaf aan aao aat aax af- afa aff afn afo aft afx an- ana anf ann ano ant anx aoa aof aon aoo aot aox at- ata atf atn ato att atx ax- axa axn axo axt axx faa faf fan fao fat fax ffa fff ffn ffo fft ffx fna fnf fnn fnt fnx foa fof fon foo fot fox fta ftf ftn fto ftt ftx fxt fxx naa naf nan nao nat nax nfa nff nfn nfo nft nna nnf nnn nno nnt no- noa nof non noo not nox nta ntf ntn nto ntt ntx nxt oaa oaf oan oao oat oax of- ofa off ofn ofo oft ofx on- ona onf onn ono ont onx oo- ooa oof oon ooo oot oox ot- ota otf otn oto ott ox- oxa oxf oxn oxo oxt oxx t-x taa taf tan tao tat tax tfa tff tfn tfo tft tfx tna tnf tnn tno tnt tnx to- toa tof ton too tot tox tta ttf ttn tto ttt ttx txf txn txt xaa xaf xan xat xfa xfn xft xfx xna xno xoa xof xon xoo xot xox xtf xtx xxo xxx