-al -ol a-a a-b a-i a-t aaa aab aae aai aal aao aat aax ab- aba abb abe abi abl abo abt abx aea aeb aee aei ael aeo aet aex ai- aia aib aie aii ail aio ait aix al- ala alb ale ali all alo alt alx aoa aob aoe aoi aol aoo aot aox at- ata atb ate ati atl ato att atx ax- axa axe axi axl axo axt axx baa bab bae bai bal bao bat bax bba bbb bbe bbi bbl bbo bbt bbx be- bea beb bee bei bel beo bet bex bi- bia bib bie bii bil bio bit bix bla blb ble bli bll blo blt blx boa bob boe boi bol boo bot box bta btb bte bti btl bto btt btx bxb bxi bxl bxo bxx eaa eab eae eai eal eao eat eax eba ebb ebe ebi ebl ebo ebt ebx eea eeb eee eel eeo eet eex eia eib eie eii eil eio eit eix ela elb ele eli ell elo elt elx eo- eoa eob eoe eoi eol eoo eot eta etb ete eti etl eto ett etx ex- exa exe exi exl exo ext exx ia- iaa iab iae iai ial iao iat iba ibb ibe ibi ibl ibo ibt ibx ie- iea iee iei iel iet iex iia iib iie iii iil iio iit iix il- ila ilb ile ili ill ilo ilt ilx io- ioa iob ioe ioi iol ioo iot ita itb ite iti itl ito itt itx ixe ixi ixl la- laa lab lae lai lal lao lat lax lba lbb lbe lbi lbl lbo lbt lbx lea leb lee lei lel leo let lex lia lib lie lii lil lio lit lix lla llb lle lli lll llo llt loa lob loe loi lol loo lot lox lta ltb lte lti ltl lto ltt ltx lxi lxo lxx o-i oaa oab oae oai oal oao oat oax ob- oba obb obe obi obl obo obt obx oea oeb oee oei oel oeo oet oex oia oib oie oii oil oio oit ola olb ole oli oll olo olt oo- ooa oob ooi ool ooo oot oox ot- ota otb ote oti otl oto ott ox- oxa oxb oxi oxo oxt oxx t-x taa tab tae tai tal tao tat tax tba tbb tbe tbi tbl tbo tbt te- tea teb tee tei tel teo tet tex tia tib tie tii til tio tit tix tla tle tli tll tlo tlt tlx to- toa tob toe toi tol too tot tox tta ttb tte tti ttl tto ttt ttx txe txi txl txt xaa xal xat xbe xbl xbx xee xel xet xex xia xie xii xio xit xix xla xlb xli xlt xoa xoi xoo xot xox xti xtx xxi xxl xxo xxx