-al -ol a-a a-b aaa aab aae aaf aal aao aax ab- aba abb abe abf abl abo abx aea aeb aee aef ael aeo aex af- afa afb afe aff afl afo afx al- ala alb ale alf all alo alx aoa aob aoe aof aol aoo aox ax- axa axe axl axo axx baa bab bae baf bal bao bax bba bbb bbe bbf bbl bbo bbx be- bea beb bee bef bel beo bex bfa bfb bfe bff bfl bfo bfx bla blb ble blf bll blo blx boa bob boe bof bol boo box bxb bxl bxo bxx eaa eab eae eaf eal eao eax eba ebb ebe ebf ebl ebo ebx eea eeb eee eef eel eeo eex ef- efa efb efe eff efl efo efx ela elb ele elf ell elo elx eo- eoa eob eoe eof eol eoo ex- exa exe exl exo exx faa fab fae faf fal fao fax fba fbb fbe fbf fbl fbo fbx fea feb fee fef fel feo fex ffa ffe fff ffl ffo ffx fla flb fle flf fll flo flx foa fob foe fof fol foo fox fxe fxx la- laa lab lae laf lal lao lax lba lbb lbe lbf lbl lbo lbx lea leb lee lef lel leo lex lfa lfb lfe lff lfl lfo lfx lla llb lle llf lll llo loa lob loe lof lol loo lox lxo lxx oaa oab oae oaf oal oao oax ob- oba obb obe obf obl obo obx oea oeb oee oef oel oeo oex of- ofa ofb ofe off ofl ofo ofx ola olb ole olf oll olo oo- ooa oob oof ool ooo oox ox- oxa oxb oxf oxo oxx xaa xaf xal xbe xbl xbx xee xel xex xfa xfe xfl xfx xla xlb xlf xoa xof xoo xox xxl xxo xxx