a-a a-b a-i a-t aaa aab aai aan aao aat aax ab- aba abb abi abn abo abt abx ai- aia aib aii ain aio ait aix an- ana anb ani ann ano ant anx aoa aob aoi aon aoo aot aox at- ata atb ati atn ato att atx ax- axa axi axn axo axt axx baa bab bai ban bao bat bax bba bbb bbi bbn bbo bbt bbx bi- bia bib bii bin bio bit bix bna bnb bni bnn bno bnt bnx boa bob boi bon boo bot box bta btb bti btn bto btt btx bxb bxi bxn bxo bxx ia- iaa iab iai ian iao iat iba ibb ibi ibn ibo ibt ibx iia iib iii iin iio iit iix in- ina inb ini inn ino int inx io- ioa iob ioi ion ioo iot ita itb iti itn ito itt itx ixi ixn n-i naa nab nai nan nao nat nax nba nbb nbi nbn nbo nbt nbx nia nib nii nin nio nit nix nna nnb nni nnn nno nnt no- noa nob noi non noo not nox nta ntb nti ntn nto ntt ntx nxt o-i oaa oab oai oan oao oat oax ob- oba obb obi obn obo obt obx oia oib oii oin oio oit on- ona onb oni onn ono ont onx oo- ooa oob ooi oon ooo oot oox ot- ota otb oti otn oto ott ox- oxa oxb oxi oxn oxo oxt oxx t-x taa tab tai tan tao tat tax tba tbb tbi tbn tbo tbt tia tib tii tin tio tit tix tna tnb tni tnn tno tnt tnx to- toa tob toi ton too tot tox tta ttb tti ttn tto ttt ttx txi txn txt xaa xan xat xbx xia xii xin xio xit xix xna xno xoa xoi xon xoo xot xox xti xtx xxi xxo xxx