a-ii aaaa aaab aaac aaaf aaai aaal aaba aabb aabc aabi aabl aaca aacb aacc aacf aaci aacl aaco aafa aafb aafc aaff aafi aafl aaib aaic aaii aala aalc aali aall aalo aaoo abaa abab abac abaf abai abal abb- abba abbb abbi abbo abca abcb abcc abcf abci abcl abff abia abib abic abil abla ablo aboa abob abof abol aboo acaa acab acac acai acba acbl acca accc accf acci acco acfc acfi acfl aci- acia acic acif acla aclc acli acoa acol afaa afao afca afcb afcc afci affa affc affi affo afia afib afif afil afla aflc afoa afol afoo aiai aiba aibl aibo aica aicc aicf aiff aifl aiia aiib aiic aila aili aioc aioi alaa alac alai alal alao alb- alba albc albi albo alca alcc alco alfa alfi ali- alia alib alif alii alil alio all- alla alli alll allo aloa aloc alof aloi alol aloo aoba aoca aola ba-i baaa baaf baal baba babb babi babo bac- baca bacc baci baco bafc baff bafo baia baib baic bail baio bala balc balf bali ball balo baol bbbb bbci bbfc bblb bcaa bcbc bcca bccc bcci bccl bcfc bcia bcof bfca bffl biaf bial biao biba bibb bibi bibl bibo bica bicc bici bico bifa biff bifi bila bili bill bilo bio- bioc bioi biol blaa blab blac blfc blic blio blob bloc bloo boab boac boai boal boba bobb bobi bobo boca boco bofa boff boi- boii boil bola boli boll bolo boob booc boof bool c-bo caaa caab caac caaf caal caba cabf cabi cabo cac- caca cacc caci caco cafa cafb cafc caff cafl caia caib caic cail caio cala calc calf cali call calo caoi caol cbac cbal cbbc cbca cbcc cbcl cbfb cbfc cbia cblb cblc cbol ccaa ccab ccac ccaf ccai ccba ccbc ccca cccb cccc cccf ccci cccl ccfa ccfc ccff ccfi ccfl ccic ccii ccil ccla cclc ccli ccob ccoc cfaa cfab cfac cfao cfbc cfca cfcb cfcf cfcl cfco cffb cfia cfoa ciaa cial ciao ciba cibc cibi cibo cica cicc cici cico cifa ciff cifl ciia ciii cila cili cill cilo ciob clab claf clai clib clic clif clii clio clob clof cloo coai coal coba cobb cobi cobo coca coco cofc coff cofi coia coif coil col- cola colb coli coll colo coob coof cool faaa faac faba fabi fabo faca facc fafa fafc faff fafi fafo fail faio fala falc fali fall falo fbla fcab fcal fcba fcca fccf fcic fcii ffcc ffff ffii fiaa fiac fiaf fial fiba fica ficc fico fifa fifc fiff fifi fifo fiii fiil fila fili fill filo flab flac flao flcl flia flic flii flob floc floo foaf foal foba foca foci foco fofo foia foil fola folc foli foll folo foof fool iaaa iaac iaai iaal iaba iaca iacc iafc iaff iafl iaia iala iall ibac ibca ibfi ibia icaa icab icac icaf icai ical icao icbc icca iccb iccc iccf icci iccl icco icfb icll icoc ifaa ifac ifao ifbb ifco ific ifil ifla iiac iica iifa iiii iiio iila iioi iioo ilac ilal ilbc ilca ilia ilic ilio ill- illa illi illo iloc iloo ioba iobi ioci iofc ioii ioio iola iolo ioof iooi iooo laaa laac laal laba labi labo laca lacc laci lacl laco lafb lafc laff laia laic lail lala lali lall lalo lbcc lbia lcac lcbc lcca lccc lcfc lcia lfca lfcc liac liao liba libc libo lica lico lifa liff lifl lifo liia liii lila lilb lili lill lilo lio- llao llcc lllc llll lloa lloc lloo loac loaf lob- loba lobb lobi lobo loca locc loci loco lofa loff lofi loic loif lola loli loll lolo loob looc loof lool oafc oafo oaic oall obai obal obba obbo obia obla oboi obol ocab ocac ocal ocbc occa occc occi ocfa oclc ofcl off- offa offc offo ofla oiba oici oiii oila olac olaf olba olbo olca olcc olfa olia olib olic olio olla olli ollo olof ooaa ooba oobi ooff ooia oola oolo oooo