-er a-a a-b aaa aab aae aak aao aar aax ab- aba abb abe abk abo abr abx aea aeb aee aek aeo aer aex aka akb ake akk ako akr aoa aob aoe aok aoo aor aox ar- ara arb are ark aro arr arx ax- axa axe axk axo axr axx baa bab bae bak bao bar bax bba bbb bbe bbk bbo bbr bbx be- bea beb bee bek beo ber bex bka bkb bke bkk bko bkr bkx boa bob boe bok boo bor box bra brb bre brk bro brr brx bxb bxo bxx eaa eab eae eak eao ear eax eba ebb ebe ebk ebo ebr ebx eea eeb eee eek eeo eer eex eka ekb eke eko ekr eo- eoa eob eoe eok eoo eor era erb ere erk ero err ex- exa exe exo exr exx ka- kaa kab kae kak kao kar kax kba kbb kbe kbk kbo kbr kbx ke- kea keb kee kek keo ker kex kkb kke kkk kkr koa kob koe kok koo kor kra krk kro krr kxo oaa oab oae oak oao oar oax ob- oba obb obe obk obo obr obx oea oeb oee oeo oer oex oka okb oke okk oko okr oo- ooa oob ook ooo oor oox or- ora orb ore ork oro orr orx ox- oxa oxb oxo oxx ra- raa rab rae rak rao rar rax rba rbb rbe rbk rbo rbr rbx re- rea reb ree rek reo rer rex rkb rke rkk rko roa rob roe rok roo ror rox rra rrb rrk rrr rxr xaa xak xar xbe xbr xbx xee xer xex xkb xke xoa xok xoo xor xox xrx xxo xxx

a-ak a-be a-ok aaaa aaab aaae aaar aaba aabb aaea aaka aake aaoe aaoo aara aare aaro abaa abab abae abak abar abax abb- abba abbb abbe abbo abbr abee aber aboa abob abok aboo abor abox abra abro aeer aeka aer- aera aero akaa akae akao akar akee aker akka akko akok akr- akra akre aoba aora aorb arab arae arak arar arax arba arbe area aree arek areo arex arka arke arko aroa arob aroe aroo aror arr- arra arre arrk arro arrr axar axer axo- axoa axxo ba-x baaa baak baar baba babb babe babo babr baek baer bak- baka bake bako bakr bar- bara barb bare bark baro barr barx bbbb bbeb bbox beak bear beba bebb bebe bebo beeb beek beer beka beke beko beo- beok beor bera bere berk bero berr boab boak boar boba bobb bobe bobo boea boee boeo boer boka boke boko boob booe book boor boox bor- bora bore bork boro borr boxa brab brae brak brao brax brea breb bree brek breo brer brex brka brkb broa brob broe brok broo bror brox brrr eaba eara earb eare earo ebba ebbo ebbr eber eboe eboo ebor ebox ebro eeea eeee eeka eeke eera eero eka- ekab ekeb ekek eker ekka ekoa eoka eora eore er-x erba erbb erbe ereb erer erke erob eroe eroo erra erre erro exa- exer exo- exor exrx kaaa kaab kaak kaar kaba kabb kabe kabo kabr kaeo kaer kaka kake kakk kako kakx kaoa kaok kaor kaox kara karb kare kark karo karr karx kaxa kaxe kbaa kbab kbae kbak kbar kbba kbbb kbbe kbbk kbbo kbbr kbeb kbee kbek kbeo kber kbex kbkb kbkk kbko kbkr kboa kbob kboe kbok kboo kbox kbra kbrb kbre kbrk kbro kbrx kbxb kbxr kbxx kea- keak kear keba kebb kebe kebr keek keer keka kekb keke keko keok ker- kera kerb kere kerk kero kerr kerx kexa kexb kexo kexx kkaa kkar kkba kkbb kkbe kkbo kkbr kkea kkex kkkk kkoa kkob kkoo kkor kkrb kkre kkrk kkro kkrr kkrx kkxa kkxk kkxx koab koae koak koar koba kobb kobe kobk kobo kobr koea koka kokb koke kokk koko kokr kokx koob kook kooo koor kora korb kore kork koro korr koxe koxr krab krae krak krar krba krbb krbe krbk krbr krbx krea kreb kree krek kreo krex krka krke krkk krko krkr krkx kroa krob kroe krok kroo kror krox krrb krre krrk krro krrr krrx krxa krxb krxk krxo krxr krxx kxaa kxar kxba kxbr kxbx kxea kxeo kxex kxkk kxkx kxoa kxok kxoo kxor kxox kxra kxrb kxre kxrk kxro kxrr kxrx kxxe kxxk kxxo kxxr kxxx o-eo oaer oake oara oare obak obba obbo obea ober obex obkb oboe obok obor obox obra obre obro oeax oera oere okak oker okka okko okok okor okra okre okro ooaa ooak ooba oobe ooer oooo oora oore orab orae orak orao orar orba orbb orbe orbo ore- orea oreb orek oreo orer orex orka orke orko oro- oroe orok oror orra orro oxa- oxea oxer oxo- oxox oxxo raab raak raba rabb rabe rabk rabo raer raka rake rakk raob raok rara rarb rare rark raro raxa rbbb rbbr rea- reae reak reao rear reba rebb rebe rebk rebo reeb reek reka reke reko rera rere rero rexx roab roak roar rob- roba robb robe robo roea roer roka roke rokk roko rokr roob rook roor roox rora rore rork roro roxa roxo rrrr xaar xara xare xbar xbee xbox xbra xeer xeka xeko xer- xera xero xexe xoka xoro xoxo xxxo xxxx

-aaa- a-box aaaee aabaa aabba aabra aaker aakko aakre abaab ababa ababe abaer abaka abake abako abara abare abbar abear abeba abebe abeer abekr abera abere aberr abkar abkoo aboab abobo aboke abook abora abore abrak abrar abrek aeaea aebbe aereo aero- aeroe aka-e akaba akabo akaoa akare akbar akera akero akker akkra akobo akoka akoko akrak akrar akro- ar-ab arab- araba arabe arabo araea arake arara arare araxa arbab arbar arbee arber arbok arbor arbre areae arear areek areka areke areo- arere arero arexx arkar arkoe aroab aroar aroba arobe aroer aroor arora arore arrak arrea arroe b-r-k baabe baake babak babar babax babee babek baber babka baboo babra bakar bakea baker