-al -ol a-a a-b a-i aaa aab aae aaf aai aal aao aas aax ab- aba abb abe abf abi abl abo abs abx aea aeb aee aef aei ael aeo aes aex af- afa afb afe aff afi afl afo afs afx ai- aia aib aie aif aii ail aio ais aix al- ala alb ale alf ali all alo als alx aoa aob aoe aof aoi aol aoo aos aox as- asa asb ase asf asi asl aso ass asx ax- axa axe axi axl axo axs axx baa bab bae baf bai bal bao bas bax bba bbb bbe bbf bbi bbl bbo bbs bbx be- bea beb bee bef bei bel beo bes bex bfa bfb bfe bff bfi bfl bfo bfs bfx bi- bia bib bie bif bii bil bio bis bix bla blb ble blf bli bll blo bls blx boa bob boe bof boi bol boo bos box bsa bsb bse bsf bsi bsl bso bss bsx bxb bxi bxl bxo bxx eaa eab eae eaf eai eal eao eas eax eba ebb ebe ebf ebi ebl ebo ebs ebx eea eeb eee eef eel eeo ees eex ef- efa efb efe eff efi efl efo efs efx eia eib eie eif eii eil eio eis eix ela elb ele elf eli ell elo els elx eo- eoa eob eoe eof eoi eol eoo eos es- esa esb ese esf esi esl eso ess esx ex- exa exe exi exl exo exs exx faa fab fae faf fai fal fao fas fax fba fbb fbe fbf fbi fbl fbo fbs fbx fea feb fee fef fei fel feo fes fex ffa ffe fff ffi ffl ffo ffs ffx fia fib fie fif fii fil fis fix fla flb fle flf fli fll flo fls flx foa fob foe fof foi fol foo fos fox fsa fsb fse fsf fsi fsl fso fss fsx fxe fxi fxs fxx i-f ia- iaa iab iae iaf iai ial iao ias iba ibb ibe ibf ibi ibl ibo ibs ibx ie- iea iee ief iei iel ies iex ifa ifb ife iff ifi ifl ifo ifs ifx iia iib iie iif iii iil iio iis iix il- ila ilb ile ilf ili ill ilo ils ilx io- ioa iob ioe iof ioi iol ioo ios is- isa isb ise isf isi isl iso iss ixe ixi ixl la- laa lab lae laf lai lal lao las lax lba lbb lbe lbf lbi lbl lbo lbs lbx lea leb lee lef lei lel leo les lex lfa lfb lfe lff lfi lfl lfo lfs lfx lia lib lie lif lii lil lio lis lix lla llb lle llf lli lll llo lls loa lob loe lof loi lol loo los lox lsa lsb lse lsf lsi lsl lso lss lxi lxo lxx o-i oaa oab oae oaf oai oal oao oas oax ob- oba obb obe obf obi obl obo obs obx oea oeb oee oef oei oel oeo oes oex of- ofa ofb ofe off ofi ofl ofo ofs ofx oia oib oie oif oii oil oio ois ola olb ole olf oli oll olo ols oo- ooa oob oof ooi ool ooo oos oox os- osa osb ose osf osi osl oso oss osx ox- oxa oxb oxf oxi oxo oxx saa sab sae saf sai sal sao sas sax sba sbb sbe sbf sbi sbl sbo sbs sbx se- sea seb see sef sei sel seo ses sex sfa sfb sfe sff sfi sfl sfo sfs sfx sia sib sie sif sii sil sio sis six sla slb sle slf sli sll slo sls slx soa sob soe sof soi sol soo sos sox ss- ssa ssb sse ssf ssi ssl sso sss ssx sxi sxl sxs xaa xaf xal xas xbe xbl xbx xee xel xes xex xfa xfe xfl xfs xfx xia xie xii xio xis xix xla xlb xlf xli xls xoa xof xoi xoo xos xox xsa xsb xsi xsl xss xxi xxl xxo xxx