-al -ol a-a a-b a-i a-t aaa aab aai aal aao aas aat aax ab- aba abb abi abl abo abs abt abx ai- aia aib aii ail aio ais ait aix al- ala alb ali all alo als alt alx aoa aob aoi aol aoo aos aot aox as- asa asb asi asl aso ass ast asx at- ata atb ati atl ato ats att atx ax- axa axi axl axo axs axt axx baa bab bai bal bao bas bat bax bba bbb bbi bbl bbo bbs bbt bbx bi- bia bib bii bil bio bis bit bix bla blb bli bll blo bls blt blx boa bob boi bol boo bos bot box bsa bsb bsi bsl bso bss bst bsx bta btb bti btl bto bts btt btx bxb bxi bxl bxo bxx ia- iaa iab iai ial iao ias iat iba ibb ibi ibl ibo ibs ibt ibx iia iib iii iil iio iis iit iix il- ila ilb ili ill ilo ils ilt ilx io- ioa iob ioi iol ioo ios iot is- isa isb isi isl iso iss ist ita itb iti itl ito its itt itx ixi ixl la- laa lab lai lal lao las lat lax lba lbb lbi lbl lbo lbs lbt lbx lia lib lii lil lio lis lit lix lla llb lli lll llo lls llt loa lob loi lol loo los lot lox lsa lsb lsi lsl lso lss lst lta ltb lti ltl lto lts ltt ltx lxi lxo lxx o-i oaa oab oai oal oao oas oat oax ob- oba obb obi obl obo obs obt obx oia oib oii oil oio ois oit ola olb oli oll olo ols olt oo- ooa oob ooi ool ooo oos oot oox os- osa osb osi osl oso oss ost osx ot- ota otb oti otl oto ots ott ox- oxa oxb oxi oxo oxt oxx saa sab sai sal sao sas sat sax sba sbb sbi sbl sbo sbs sbt sbx sia sib sii sil sio sis sit six sla slb sli sll slo sls slt slx soa sob soi sol soo sos sot sox ss- ssa ssb ssi ssl sso sss sst ssx sta stb sti stl sto sts stt stx sxi sxl sxs sxt t-x taa tab tai tal tao tas tat tax tba tbb tbi tbl tbo tbs tbt tia tib tii til tio tis tit tix tla tli tll tlo tls tlt tlx to- toa tob toi tol too tos tot tox tsa tsb tsi tsl tso tss tst tsx tta ttb tti ttl tto tts ttt ttx txi txl txs txt xaa xal xas xat xbl xbx xia xii xio xis xit xix xla xlb xli xls xlt xoa xoi xoo xos xot xox xsa xsb xsi xsl xss xst xti xts xtx xxi xxl xxo xxx