a-a a-b a-i a-t aaa aab aad aae aaf aai aao aat aax ab- aba abb abd abe abf abi abo abt abx ad- ada adb add ade adf adi ado adt adx aea aeb aed aee aef aei aeo aet aex af- afa afb afd afe aff afi afo aft afx ai- aia aib aid aie aif aii aio ait aix aoa aob aod aoe aof aoi aoo aot aox at- ata atb atd ate atf ati ato att atx ax- axa axe axi axo axt axx baa bab bad bae baf bai bao bat bax bba bbb bbd bbe bbf bbi bbo bbt bbx bda bdb bdd bde bdf bdi bdo bdt bdx be- bea beb bed bee bef bei beo bet bex bfa bfb bfd bfe bff bfi bfo bft bfx bi- bia bib bid bie bif bii bio bit bix boa bob bod boe bof boi boo bot box bta btb btd bte btf bti bto btt btx bxb bxd bxi bxo bxx daa dab dad dae daf dai dao dat dax dba dbb dbd dbe dbf dbi dbo dbt dbx dda ddb ddd dde ddf ddi ddo ddt ddx de- dea deb ded dee def dei deo det dex dfa dfb dfd dfe dff dfi dfo dft dfx di- dia dib did die dif dii dio dit dix doa dob dod doe dof doi doo dot dox dta dtb dtd dte dtf dti dto dtt dtx dxd dxi dxo dxt dxx eaa eab ead eae eaf eai eao eat eax eba ebb ebd ebe ebf ebi ebo ebt ebx ed- eda edb edd ede edf edi edo edt edx eea eeb eed eee eef eeo eet eex ef- efa efb efd efe eff efi efo eft efx eia eib eid eie eif eii eio eit eix eo- eoa eob eod eoe eof eoi eoo eot eta etb etd ete etf eti eto ett etx ex- exa exd exe exi exo ext exx faa fab fad fae faf fai fao fat fax fba fbb fbd fbe fbf fbi fbo fbt fbx fda fdb fdd fde fdf fdi fdo fdt fdx fea feb fed fee fef fei feo fet fex ffa ffd ffe fff ffi ffo fft ffx fia fib fid fie fif fii fit fix foa fob foe fof foi foo fot fox fta ftb ftd fte ftf fti fto ftt ftx fxe fxi fxt fxx i-d i-f ia- iaa iab iad iae iaf iai iao iat iba ibb ibd ibe ibf ibi ibo ibt ibx ida idb idd ide idf idi ido idt idx ie- iea ied iee ief iei iet iex ifa ifb ifd ife iff ifi ifo ift ifx iia iib iid iie iif iii iio iit iix io- ioa iob iod ioe iof ioi ioo iot ita itb itd ite itf iti ito itt itx ixe ixi o-i oaa oab oad oae oaf oai oao oat oax ob- oba obb obd obe obf obi obo obt obx oda odb odd ode odf odi odo odt oea oeb oed oee oef oei oeo oet oex of- ofa ofb ofd ofe off ofi ofo oft ofx oia oib oid oie oif oii oio oit oo- ooa oob ood oof ooi ooo oot oox ot- ota otb otd ote otf oti oto ott ox- oxa oxb oxf oxi oxo oxt oxx t-x taa tab tad tae taf tai tao tat tax tba tbb tbd tbe tbf tbi tbo tbt tda tdb tdd tde tdf tdi tdo tdt tdx te- tea teb ted tee tef tei teo tet tex tfa tfb tfd tfe tff tfi tfo tft tfx tia tib tid tie tif tii tio tit tix to- toa tob tod toe tof toi too tot tox tta ttb ttd tte ttf tti tto ttt ttx txe txf txi txt xaa xad xaf xat xbe xbx xda xdb xde xdf xdi xdt xed xee xet xex xfa xfe xft xfx xia xie xii xio xit xix xoa xod xof xoi xoo xot xox xtf xti xtx xxi xxo xxx