-er eee eef eeo eer eex ef- efe eff efo efr efx eo- eoe eof eoo eoq eor eou eqe eqf eqq equ ere erf ero erq err eru eu- eue euf eur eux ex- exe exo exr exu exx fee fef feo fer feu fex ffe fff ffo ffr ffu ffx foe fof foo for fou fox fqx fre frf fro frq frr fru fue fuf fuo fur fuu fux fxe fxr fxu fxx oee oef oeo oer oex of- ofe off ofo ofr ofu ofx oo- oof ooo oor oox oqo or- ore orf oro orr oru orx ou- oue ouf ouo our ox- oxf oxo oxx qee qef qeo qex qfe qff qfx qof qoo qor qqq qqu qre qru qu- que quo qur qux qxe re- ree ref reo req rer reu rex rfe rff rfo rfq rfr rfu roe rof roo ror rou rox rrf rrq rrr rru rue ruf ruo rur ruu rux rxr uee uef uer ufe uff ufo ufr ufu ufx uoe uoo uor uox ur- ure urf uro urr uru urx uue uur uuu uxf uxo uxr uxu xee xeq xer xeu xex xfe xfx xof xoo xor xox xrf xrx xue xxo xxx