a-ii aaaa aaab aaac aaad aaai aaba aabb aabc aabd aabi aaca aacb aacc aacd aaci aacu aada aadc aadi aadu aaib aaic aaii abaa abab abac abad abai abau abb- abba abbb abbi abca abcb abcc abcd abci abda abdi abdu abia abib abic abid abiu abua abud acaa acab acac acad acai acba acca accc accd acci accu acda acdb acdc acdi aci- acia acic acid acu- adaa adab adac adad adai adba adbc adbi adcc adci adda addc addd addi addu adia adib adic adua adub aiai aiba aica aicc aicd aida aidb aidc aidi aidu aiia aiib aiic aiid aiud aiui auaa auca auci audc audi ba-i baaa baad baba babb babi babu bac- baca bacc baci bada badb badd badi badu baia baib baic baid bau- baud bbad bbau bbbb bbci bbdd bcaa bcbc bcca bccc bcci bcda bcia bcuc bdbc bddc bdii biad biba bibb bibi bica bicc bici bida bidi bidu buad buba bubb bubi bubu buca bucc buci bucu buda budb budd budi budu buic buid buiu c-cd caaa caab caac caba cabi cabu cac- caca cacc caci cada cadc cadd cadi cadu caia caib caic caid caiu cauc cbac cbbc cbca cbcc cbcu cbdb cbdc cbdi cbia cbid ccaa ccab ccac ccad ccai ccba ccbc ccca cccb cccc ccci cccu ccdc ccdi ccic ccid ccii ccuc cdaa cdac cdad cdai cdba cdda cddb cdic cdii ciaa ciau ciba cibc cibi cica cicc cici cicu cida cidc cidi ciia ciid ciii ciuc cuau cub- cuba cubb cubi cuca cucc cuci cuda cudi cui- daab daad daau daba dabb dabu daca daci dada dadi dadu daia daid daub daud dbcc dcbc dcca dccb dccc dcci dccu dcdb dcia dcii dddd ddub dia- diab diac diad diba dibb dica dici dida didi didu diii duaa duab duad dub- duba dubb dubc dubu duca duda dudd dudu duid iaaa iaac iaai iaba iaca iacc iacu iadb iadc iaia ibac ibad ibca ibia ibid icaa icab icac icad icai icbc icbd icca iccb iccc icci iccu icdc icdd icub idad idca idda idia idic idid idub iiac iica iicd iida iiii iiuc iucc iuiu uabc uaca uaua ubac ubba ubbi ubic ubid ubii ubud ucad ucai ucbc ucca ucci ucdc ucdd ucua udaa udad udau udbc udca uddi udic udid uica uuuu