a-do a-ii aaaa aaab aaac aaad aaai aaba aabb aabc aabd aabi aaca aacb aacc aacd aaci aaco aada aadc aadi aaib aaic aaii aaoo abaa abab abac abad abai abb- abba abbb abbi abbo abca abcb abcc abcd abci abda abdi abdo abia abib abic abid aboa abob abod aboo acaa acab acac acad acai acba acca accc accd acci acco acda acdb acdc acdi aci- acia acic acid acoa acod adaa adab adac adad adai adao adba adbc adbi adcc adci adda addc addd addi addo adia adib adic adio adob adoc adod adoo aiai aiba aibo aica aicc aicd aida aidb aidc aidi aiia aiib aiic aiid aioc aioi aoba aoca ba-i baaa baad baba babb babi babo bac- baca bacc baci baco bada badb badd badi bado baia baib baic baid baio bbad bbbb bbci bbdd bbdo bcaa bcbc bcca bccc bcci bcda bcia bdbc bddc bdii biad biao biba bibb bibi bibo bica bicc bici bico bida bidi bido bio- bioc bioi boab boac boad boai boba bobb bobi bobo boca boco boda bodb bodi bodo boi- boid boii boob booc bood c-bo c-cd caaa caab caac caba cabi cabo cac- caca cacc caci caco cada cadc cadd cadi cado caia caib caic caid caio caod caoi cbac cbbc cbca cbcc cbdb cbdc cbdi cbdo cbia cbid ccaa ccab ccac ccad ccai ccba ccbc ccca cccb cccc ccci ccdc ccdi ccic ccid ccii ccob ccoc ccod cdaa cdac cdad cdai cdba cdda cddb cdic cdii cdio ciaa ciao ciba cibc cibi cibo cica cicc cici cico cida cidc cidi ciia ciid ciii ciob coad coai coba cobb cobi cobo coca coco coda codd codi coia coob cood d-bo daab daad daba dabb dabo daca daci dada dadi dado daia daid daio dbcc dcbc dcca dccb dccc dcci dcdb dcia dcii dcio dddd ddoc dia- diab diac diad diao diba dibb dibo dica dici dico dida didi dido diii dioc doab doba dobb dobi doca doci doco dod- doda dodd dodi dodo doid doob dood iaaa iaac iaai iaba iaca iacc iadb iadc iaia ibac ibad ibca ibdo ibia ibid icaa icab icac icad icai icao icbc icbd icca iccb iccc icci icco icdc icdd icoc icod idad idca idda iddo idia idic idid idio idoc iiac iica iicd iida iiii iiio iioi iioo ioba iobi ioci iod- ioda iodd iodo ioii ioio iooi iooo oaic obad obai obba obbo obia obid oboi ocab ocac ocad ocbc occa occc occi odac odai odbo odci odda oddd oddi odia odic odio odoo oiba oici oido oiii ooaa ooba oobi ooda oodi ooia ooid oooo