-al -ol a-a a-b a-i aaa aab aai aal aao aas aax ab- aba abb abi abl abo abs abx ai- aia aib aii ail aio ais aix al- ala alb ali all alo als alx aoa aob aoi aol aoo aos aox as- asa asb asi asl aso ass asx ax- axa axi axl axo axs axx baa bab bai bal bao bas bax bba bbb bbi bbl bbo bbs bbx bi- bia bib bii bil bio bis bix bla blb bli bll blo bls blx boa bob boi bol boo bos box bsa bsb bsi bsl bso bss bsx bxb bxi bxl bxo bxx ia- iaa iab iai ial iao ias iba ibb ibi ibl ibo ibs ibx iia iib iii iil iio iis iix il- ila ilb ili ill ilo ils ilx io- ioa iob ioi iol ioo ios is- isa isb isi isl iso iss ixi ixl la- laa lab lai lal lao las lax lba lbb lbi lbl lbo lbs lbx lia lib lii lil lio lis lix lla llb lli lll llo lls loa lob loi lol loo los lox lsa lsb lsi lsl lso lss lxi lxo lxx o-i oaa oab oai oal oao oas oax ob- oba obb obi obl obo obs obx oia oib oii oil oio ois ola olb oli oll olo ols oo- ooa oob ooi ool ooo oos oox os- osa osb osi osl oso oss osx ox- oxa oxb oxi oxo oxx saa sab sai sal sao sas sax sba sbb sbi sbl sbo sbs sbx sia sib sii sil sio sis six sla slb sli sll slo sls slx soa sob soi sol soo sos sox ss- ssa ssb ssi ssl sso sss ssx sxi sxl sxs xaa xal xas xbl xbx xia xii xio xis xix xla xlb xli xls xoa xoi xoo xos xox xsa xsb xsi xsl xss xxi xxl xxo xxx