a-ii aaaa aaab aaac aaad aaaf aaai aaba aabb aabc aabd aabi aaca aacb aacc aacd aacf aaci aada aadc aadi aafa aafb aafc aafd aaff aafi aaib aaic aaii abaa abab abac abad abaf abai abb- abba abbb abbi abca abcb abcc abcd abcf abci abda abdi abff abia abib abic abid acaa acab acac acad acai acba acca accc accd accf acci acda acdb acdc acdf acdi acfc acfd acfi aci- acia acic acid acif adaa adab adac adad adai adba adbc adbi adcc adci adda addc addd addi adfa adfc adia adib adic adif afaa afad afca afcb afcc afci afdb afdc affa affc affi afia afib afid afif aiai aiba aica aicc aicd aicf aida aidb aidc aidi aifd aiff aiia aiib aiic aiid ba-i baaa baad baaf baba babb babi bac- baca bacc baci bada badb badd badi bafc baff baia baib baic baid bbad bbbb bbci bbdd bbfc bcaa bcbc bcca bccc bcci bcda bcfc bcia bdbc bddc bdii bfca biad biaf biba bibb bibi bica bicc bici bida bidi bifa biff bifi c-cd caaa caab caac caaf caba cabf cabi cac- caca cacc caci cada cadc cadd cadi cafa cafb cafc caff caia caib caic caid cbac cbbc cbca cbcc cbdb cbdc cbdi cbfb cbfc cbia cbid ccaa ccab ccac ccad ccaf ccai ccba ccbc ccca cccb cccc cccf ccci ccdc ccdf ccdi ccfa ccfc ccfd ccff ccfi ccic ccid ccii cdaa cdac cdad cdai cdba cdbf cdda cddb cdfa cdic cdii cfaa cfab cfac cfbc cfca cfcb cfcf cfda cffb cfia ciaa ciba cibc cibi cica cicc cici cida cidc cidi cifa ciff ciia ciid ciii daab daad daba dabb daca daci dada dadi dafa dafc daff dafi daia daid dbcc dbfc dcbc dcca dccb dccc dcci dcdb dcfc dcia dcii dddd dfaf dfcc dffa dia- diab diac diad diaf diba dibb dica dici dida didi dif- difa diff diii faaa faac faad faba fabd fabi faca facc fada fadd fadi fafa fafc faff fafi faid fcab fcba fcca fccf fcda fcic fcii fdca fdic ffcc ffff ffii fiaa fiac fiad fiaf fiba fica ficc fida fidc fidf fifa fifc fiff fifi fiii iaaa iaac iaai iaba iaca iacc iadb iadc iafc iaff iaia ibac ibad ibca ibfi ibia ibid icaa icab icac icad icaf icai icbc icbd icca iccb iccc iccf icci icdc icdd icfb idad idca idda idfa idfc idia idic idid ifaa ifac ifbb ifcd ifda ific ifid iiac iica iicd iida iifa iiii