-al -er -ol a-a a-b aaa aab aae aaf aal aao aar aax ab- aba abb abe abf abl abo abr abx aea aeb aee aef ael aeo aer aex af- afa afb afe aff afl afo afr afx al- ala alb ale alf all alo alr alx aoa aob aoe aof aol aoo aor aox ar- ara arb are arf arl aro arr arx ax- axa axe axl axo axr axx baa bab bae baf bal bao bar bax bba bbb bbe bbf bbl bbo bbr bbx be- bea beb bee bef bel beo ber bex bfa bfb bfe bff bfl bfo bfr bfx bla blb ble blf bll blo blr blx boa bob boe bof bol boo bor box bra brb bre brf brl bro brr brx bxb bxl bxo bxx eaa eab eae eaf eal eao ear eax eba ebb ebe ebf ebl ebo ebr ebx eea eeb eee eef eel eeo eer eex ef- efa efb efe eff efl efo efr efx ela elb ele elf ell elo elr elx eo- eoa eob eoe eof eol eoo eor era erb ere erf erl ero err ex- exa exe exl exo exr exx faa fab fae faf fal fao far fax fba fbb fbe fbf fbl fbo fbr fbx fea feb fee fef fel feo fer fex ffa ffe fff ffl ffo ffr ffx fla flb fle flf fll flo flr flx foa fob foe fof fol foo for fox fra frb fre frf frl fro frr fxe fxr fxx la- laa lab lae laf lal lao lar lax lba lbb lbe lbf lbl lbo lbr lbx lea leb lee lef lel leo ler lex lfa lfb lfe lff lfl lfo lfr lfx lla llb lle llf lll llo llr loa lob loe lof lol loo lor lox lra lrb lrf lro lrr lxo lxr lxx oaa oab oae oaf oal oao oar oax ob- oba obb obe obf obl obo obr obx oea oeb oee oef oel oeo oer oex of- ofa ofb ofe off ofl ofo ofr ofx ola olb ole olf oll olo oo- ooa oob oof ool ooo oor oox or- ora orb ore orf orl oro orr orx ox- oxa oxb oxf oxo oxx ra- raa rab rae raf ral rao rar rax rba rbb rbe rbf rbl rbo rbr rbx re- rea reb ree ref rel reo rer rex rfa rfb rfe rff rfl rfo rfr rla rle rlf rll rlo rlr roa rob roe rof rol roo ror rox rra rrb rrf rrl rrr rxr xaa xaf xal xar xbe xbl xbr xbx xee xel xer xex xfa xfe xfl xfx xla xlb xlf xlr xoa xof xoo xor xox xrf xrx xxl xxo xxx