-al a-a a-b a-i a-t aaa aab aai aal aar aat aax ab- aba abb abi abl abr abt abx ai- aia aib aii ail air ait aix al- ala alb ali all alr alt alx ar- ara arb ari arl arr art arx at- ata atb ati atl atr att atx ax- axa axi axl axr axt axx baa bab bai bal bar bat bax bba bbb bbi bbl bbr bbt bbx bi- bia bib bii bil bir bit bix bla blb bli bll blr blt blx bra brb bri brl brr brt brx bta btb bti btl btr btt btx bxb bxi bxl bxx ia- iaa iab iai ial iar iat iba ibb ibi ibl ibr ibt ibx iia iib iii iil iir iit iix il- ila ilb ili ill ilr ilt ilx ir- ira irb iri irl irr irt irx ita itb iti itl itt itx ixi ixl la- laa lab lai lal lar lat lax lba lbb lbi lbl lbr lbt lbx lia lib lii lil lir lit lix lla llb lli lll llr llt lra lrb lri lrr lrt lta ltb lti ltl ltr ltt ltx lxi lxr lxx ra- raa rab rai ral rar rat rax rba rbb rbi rbl rbr rbt rbx ria rib rii ril rir rit rix rla rli rll rlr rlt rra rrb rri rrl rrr rrt rta rtb rti rtl rtr rtt rtx rxr t-x taa tab tai tal tar tat tax tba tbb tbi tbl tbr tbt tia tib tii til tir tit tix tla tli tll tlr tlt tlx tra trb tri trl trr trt trx tta ttb tti ttl ttr ttt ttx txi txl txt xaa xal xar xat xbl xbr xbx xia xii xit xix xla xlb xli xlr xlt xrt xrx xti xtr xtx xxi xxl xxx