-er a-a a-b aaa aab aae aaf aao aar aax ab- aba abb abe abf abo abr abx aea aeb aee aef aeo aer aex af- afa afb afe aff afo afr afx aoa aob aoe aof aoo aor aox ar- ara arb are arf aro arr arx ax- axa axe axo axr axx baa bab bae baf bao bar bax bba bbb bbe bbf bbo bbr bbx be- bea beb bee bef beo ber bex bfa bfb bfe bff bfo bfr bfx boa bob boe bof boo bor box bra brb bre brf bro brr brx bxb bxo bxx eaa eab eae eaf eao ear eax eba ebb ebe ebf ebo ebr ebx eea eeb eee eef eeo eer eex ef- efa efb efe eff efo efr efx eo- eoa eob eoe eof eoo eor era erb ere erf ero err ex- exa exe exo exr exx faa fab fae faf fao far fax fba fbb fbe fbf fbo fbr fbx fea feb fee fef feo fer fex ffa ffe fff ffo ffr ffx foa fob foe fof foo for fox fra frb fre frf fro frr fxe fxr fxx oaa oab oae oaf oao oar oax ob- oba obb obe obf obo obr obx oea oeb oee oef oeo oer oex of- ofa ofb ofe off ofo ofr ofx oo- ooa oob oof ooo oor oox or- ora orb ore orf oro orr orx ox- oxa oxb oxf oxo oxx ra- raa rab rae raf rao rar rax rba rbb rbe rbf rbo rbr rbx re- rea reb ree ref reo rer rex rfa rfb rfe rff rfo rfr roa rob roe rof roo ror rox rra rrb rrf rrr rxr xaa xaf xar xbe xbr xbx xee xer xex xfa xfe xfx xoa xof xoo xor xox xrf xrx xxo xxx

a-be aaaa aaab aaae aaaf aaar aaba aabb aaea aafa aafb aaff aaoe aaoo aara aare aaro abaa abab abae abaf abar abax abb- abba abbb abbe abbo abbr abee aber abff aboa abob abof aboo abor abox abra abro aeaf aeer aer- aera aero afaa afao afar afee afer affa affo afoa afoe afoo afor afox afr- afra afre afro afxe aoba aora aorb arab arae araf arar arax arba arbe area aree aref areo arex arfa arfb arff aroa arob aroe aroo aror arr- arra arre arro arrr axaf axar axer axfr axo- axoa axof axxo ba-x baaa baaf baar baba babb babe babo babr baer baff bafo bar- bara barb bare barf baro barr barx bbbb bbeb bbox beaf bear beba bebb bebe bebo beeb beef beer befa befe beff befo beo- beof beor bera bere bero berr boab boar boba bobb bobe bobo boea boee boef boeo boer bofa bofe boff boob booe boof boor boox bor- bora bore borf boro borr boxa brab brae braf brao brax brea breb bree bref breo brer brex broa brob broe broo bror brox brrr eaaf eaba eafb eara earb eare earo ebba ebbo ebbr eber eboe eboo ebor ebox ebro eeea eeee eefa eefe eera eero efab efax efbr efeo effa efor eora eore er-x eraf erba erbb erbe ereb erer erfx erob eroe eroo erra erre erro exa- exer exfo exo- exor exrx faaa faba fabe fabo faeb faex fafa fafe faff fafo fara farb fare faro farr faxe fbar feaf fear feba febo feeb feer fefe feff fefo feof fera ferb fere fero ferr ffar ffee ffff ffrr foaf foar foba foer fofo foof for- fora forb fore foro forr foxe foxx frab frae frax frea free freo frex frob froe o-eo oaer oafo oara oare obba obbo obea ober obex oboe obor obox obra obre obro oeax oera oere ofer off- offa offe offo offr ofor ofra ofre ooaa ooba oobe ooer ooff oooo oora oore orab orae orao orar orba orbb orbe orbo ore- orea oreb oreo orer orex orfe orff oro- oroe orof oror orra orro oxa- oxea oxer oxo- oxof oxox oxxo raab raaf raba rabb rabe rabo raef raer rafa rafe raff raob rara rarb rare rarf raro raxa rbaf rbbb rbbr rea- reae reaf reao rear reba rebb rebe rebo reeb reef refe reff refr reof rera rere rero rexx rfae rfef roab roaf roar rob- roba robb robe robo roea roer rofe roff rofo roob roof roor roox rora rore roro roxa roxo rrrr xaar xara xare xbar xbee xbox xbra xeer xefe xer- xera xero xexe xfer xoro xoxo xxxo xxxx

-aaa- a-box aaaee aabaa aabba aabra aaeaf abaab ababa ababe abaer abara abare abbar abear abeba abebe abeer abera abere aberr abfab aboab abobo abora abore abrar aeaea aebbe aereo aero- aeroe afara afare afear afefe afere affer affor afore afoxe afree afro- afrob ar-ab arab- araba arabe arabo araea arafo arara arare araxa arbab arbar arbee arber arbor arbre areae arear areef areo- arere arero arexx arfe aroab aroar aroba arobe aroer aroof aroor arora arore arrea arroe baabe babar babax babee baber baboo babra baffa bafra baoro bar-x baraa barab barao barar barba barbe barea bareo barer barff baro- baroa barof baroo baror barra barre barro bbbee bbear be-er be-ro beafe beara beare bebar beber bebox bebra beebe beffe befoe befor beofe beoff berar berba berbe berea berob beroe beror berra berre bexar bo-bo boaro bobar bobea bobr bobre boero boffa boffo booba booer boora boore borax borba borbo borea boree borer borex boro- boroa boroo borox borra borre borro boxbe boxee boxer boxof braff bre-x breba breef breer breo- brera brere brobo broer brora broxa brrar brrrr e-box eafre earar earof ebara ebber eeeee efare efere effer effra efore eofor eorre eraof erbaa erbar erbbe erber erear erere eroor erora erore error exaro exera exorb exore f-box fabae fabbo faber faboo fabor fabra fabre fabro faora farab farao farbe farbo fareb farer farex farfa farob faroe faroo farre farro faxer feare febre feeor feere fefor feoff ferae ferox ferr- ferra ferre ferro fobar fofao foore for-a fore- foreo forex forra