a-a a-b a-i a-t aaa aab aai aan aar aat aax ab- aba abb abi abn abr abt abx ai- aia aib aii ain air ait aix an- ana anb ani ann anr ant anx ar- ara arb ari arn arr art arx at- ata atb ati atn atr att atx ax- axa axi axn axr axt axx baa bab bai ban bar bat bax bba bbb bbi bbn bbr bbt bbx bi- bia bib bii bin bir bit bix bna bnb bni bnn bnr bnt bnx bra brb bri brn brr brt brx bta btb bti btn btr btt btx bxb bxi bxn bxx ia- iaa iab iai ian iar iat iba ibb ibi ibn ibr ibt ibx iia iib iii iin iir iit iix in- ina inb ini inn inr int inx ir- ira irb iri irn irr irt irx ita itb iti itn itt itx ixi ixn n-i naa nab nai nan nar nat nax nba nbb nbi nbn nbr nbt nbx nia nib nii nin nir nit nix nna nnb nni nnn nnt nra nrb nri nrn nrr nrt nrx nta ntb nti ntn ntr ntt ntx nxt ra- raa rab rai ran rar rat rax rba rbb rbi rbn rbr rbt rbx ria rib rii rin rir rit rix rna rnb rni rnn rnr rnt rra rrb rri rrn rrr rrt rta rtb rti rtn rtr rtt rtx rxr t-x taa tab tai tan tar tat tax tba tbb tbi tbn tbr tbt tia tib tii tin tir tit tix tna tnb tni tnn tnr tnt tnx tra trb tri trn trr trt trx tta ttb tti ttn ttr ttt ttx txi txn txt xaa xan xar xat xbr xbx xia xii xin xit xix xna xrt xrx xti xtr xtx xxi xxx