a-a a-b a-i a-t aaa aab aai aan aao aar aat aax ab- aba abb abi abn abo abr abt abx ai- aia aib aii ain aio air ait aix an- ana anb ani ann ano anr ant anx aoa aob aoi aon aoo aor aot aox ar- ara arb ari arn aro arr art arx at- ata atb ati atn ato atr att atx ax- axa axi axn axo axr axt axx baa bab bai ban bao bar bat bax bba bbb bbi bbn bbo bbr bbt bbx bi- bia bib bii bin bio bir bit bix bna bnb bni bnn bno bnr bnt bnx boa bob boi bon boo bor bot box bra brb bri brn bro brr brt brx bta btb bti btn bto btr btt btx bxb bxi bxn bxo bxx ia- iaa iab iai ian iao iar iat iba ibb ibi ibn ibo ibr ibt ibx iia iib iii iin iio iir iit iix in- ina inb ini inn ino inr int inx io- ioa iob ioi ion ioo ior iot ir- ira irb iri irn iro irr irt irx ita itb iti itn ito itt itx ixi ixn n-i naa nab nai nan nao nar nat nax nba nbb nbi nbn nbo nbr nbt nbx nia nib nii nin nio nir nit nix nna nnb nni nnn nno nnt no- noa nob noi non noo nor not nox nra nrb nri nrn nro nrr nrt nrx nta ntb nti ntn nto ntr ntt ntx nxt o-i oaa oab oai oan oao oar oat oax ob- oba obb obi obn obo obr obt obx oia oib oii oin oio oir oit on- ona onb oni onn ono onr ont onx oo- ooa oob ooi oon ooo oor oot oox or- ora orb ori orn oro orr ort orx ot- ota otb oti otn oto otr ott ox- oxa oxb oxi oxn oxo oxt oxx ra- raa rab rai ran rao rar rat rax rba rbb rbi rbn rbo rbr rbt rbx ria rib rii rin rio rir rit rix rna rnb rni rnn rno rnr rnt roa rob roi ron roo ror rot rox rra rrb rri rrn rrr rrt rta rtb rti rtn rto rtr rtt rtx rxr t-x taa tab tai tan tao tar tat tax tba tbb tbi tbn tbo tbr tbt tia tib tii tin tio tir tit tix tna tnb tni tnn tno tnr tnt tnx to- toa tob toi ton too tor tot tox tra trb tri trn tro trr trt trx tta ttb tti ttn tto ttr ttt ttx txi txn txt xaa xan xar xat xbr xbx xia xii xin xio xit xix xna xno xoa xoi xon xoo xor xot xox xrt xrx xti xtr xtx xxi xxo xxx