-al a-a a-b a-i a-t aaa aab aai aal aas aat aax ab- aba abb abi abl abs abt abx ai- aia aib aii ail ais ait aix al- ala alb ali all als alt alx as- asa asb asi asl ass ast asx at- ata atb ati atl ats att atx ax- axa axi axl axs axt axx baa bab bai bal bas bat bax bba bbb bbi bbl bbs bbt bbx bi- bia bib bii bil bis bit bix bla blb bli bll bls blt blx bsa bsb bsi bsl bss bst bsx bta btb bti btl bts btt btx bxb bxi bxl bxx ia- iaa iab iai ial ias iat iba ibb ibi ibl ibs ibt ibx iia iib iii iil iis iit iix il- ila ilb ili ill ils ilt ilx is- isa isb isi isl iss ist ita itb iti itl its itt itx ixi ixl la- laa lab lai lal las lat lax lba lbb lbi lbl lbs lbt lbx lia lib lii lil lis lit lix lla llb lli lll lls llt lsa lsb lsi lsl lss lst lta ltb lti ltl lts ltt ltx lxi lxx saa sab sai sal sas sat sax sba sbb sbi sbl sbs sbt sbx sia sib sii sil sis sit six sla slb sli sll sls slt slx ss- ssa ssb ssi ssl sss sst ssx sta stb sti stl sts stt stx sxi sxl sxs sxt t-x taa tab tai tal tas tat tax tba tbb tbi tbl tbs tbt tia tib tii til tis tit tix tla tli tll tls tlt tlx tsa tsb tsi tsl tss tst tsx tta ttb tti ttl tts ttt ttx txi txl txs txt xaa xal xas xat xbl xbx xia xii xis xit xix xla xlb xli xls xlt xsa xsb xsi xsl xss xst xti xts xtx xxi xxl xxx