a-a a-b a-i a-t aaa aab aae aai aan aao aat aax ab- aba abb abe abi abn abo abt abx aea aeb aee aei aen aeo aet aex ai- aia aib aie aii ain aio ait aix an- ana anb ane ani ann ano ant anx aoa aob aoe aoi aon aoo aot aox at- ata atb ate ati atn ato att atx ax- axa axe axi axn axo axt axx baa bab bae bai ban bao bat bax bba bbb bbe bbi bbn bbo bbt bbx be- bea beb bee bei ben beo bet bex bi- bia bib bie bii bin bio bit bix bna bnb bne bni bnn bno bnt bnx boa bob boe boi bon boo bot box bta btb bte bti btn bto btt btx bxb bxi bxn bxo bxx eaa eab eae eai ean eao eat eax eba ebb ebe ebi ebn ebo ebt ebx eea eeb eee een eeo eet eex eia eib eie eii ein eio eit eix en- ena enb ene eni enn eno ent eo- eoa eob eoe eoi eon eoo eot eta etb ete eti etn eto ett etx ex- exa exe exi exo ext exx ia- iaa iab iae iai ian iao iat iba ibb ibe ibi ibn ibo ibt ibx ie- iea iee iei ien iet iex iia iib iie iii iin iio iit iix in- ina inb ine ini inn ino int inx io- ioa iob ioe ioi ion ioo iot ita itb ite iti itn ito itt itx ixe ixi ixn n-i naa nab nae nai nan nao nat nax nba nbb nbe nbi nbn nbo nbt nbx ne- nea neb nee nei nen neo net nex nia nib nie nii nin nio nit nix nna nnb nne nni nnn nno nnt no- noa nob noe noi non noo not nox nta ntb nte nti ntn nto ntt ntx nxt o-i oaa oab oae oai oan oao oat oax ob- oba obb obe obi obn obo obt obx oea oeb oee oei oen oeo oet oex oia oib oie oii oin oio oit on- ona onb one oni onn ono ont onx oo- ooa oob ooi oon ooo oot oox ot- ota otb ote oti otn oto ott ox- oxa oxb oxi oxn oxo oxt oxx t-x taa tab tae tai tan tao tat tax tba tbb tbe tbi tbn tbo tbt te- tea teb tee tei ten teo tet tex tia tib tie tii tin tio tit tix tna tnb tne tni tnn tno tnt tnx to- toa tob toe toi ton too tot tox tta ttb tte tti ttn tto ttt ttx txe txi txn txt xaa xan xat xbe xbx xee xen xet xex xia xie xii xin xio xit xix xna xno xoa xoi xon xoo xot xox xti xtx xxi xxo xxx