a-ii aaaa aaab aaac aaaf aaai aaal aaba aabb aabc aabi aabl aaca aacb aacc aacf aaci aacl aafa aafb aafc aaff aafi aafl aaib aaic aaii aala aalc aali aall abaa abab abac abaf abai abal abb- abba abbb abbi abca abcb abcc abcf abci abcl abff abia abib abic abil abla acaa acab acac acai acba acbl acca accc accf acci acfc acfi acfl aci- acia acic acif acla aclc acli afaa afca afcb afcc afci affa affc affi afia afib afif afil afla aflc aiai aiba aibl aica aicc aicf aiff aifl aiia aiib aiic aila aili alaa alac alai alal alb- alba albc albi alca alcc alfa alfi ali- alia alib alif alii alil all- alla alli alll ba-i baaa baaf baal baba babb babi bac- baca bacc baci bafc baff baia baib baic bail bala balc balf bali ball bbbb bbci bbfc bblb bcaa bcbc bcca bccc bcci bccl bcfc bcia bfca bffl biaf bial biba bibb bibi bibl bica bicc bici bifa biff bifi bila bili bill blaa blab blac blfc blic caaa caab caac caaf caal caba cabf cabi cac- caca cacc caci cafa cafb cafc caff cafl caia caib caic cail cala calc calf cali call cbac cbal cbbc cbca cbcc cbcl cbfb cbfc cbia cblb cblc ccaa ccab ccac ccaf ccai ccba ccbc ccca cccb cccc cccf ccci cccl ccfa ccfc ccff ccfi ccfl ccic ccii ccil ccla cclc ccli cfaa cfab cfac cfbc cfca cfcb cfcf cfcl cffb cfia ciaa cial ciba cibc cibi cica cicc cici cifa ciff cifl ciia ciii cila cili cill clab claf clai clib clic clif clii faaa faac faba fabi faca facc fafa fafc faff fafi fail fala falc fali fall fbla fcab fcal fcba fcca fccf fcic fcii ffcc ffff ffii fiaa fiac fiaf fial fiba fica ficc fifa fifc fiff fifi fiii fiil fila fili fill flab flac flcl flia flic flii iaaa iaac iaai iaal iaba iaca iacc iafc iaff iafl iaia iala iall ibac ibca ibfi ibia icaa icab icac icaf icai ical icbc icca iccb iccc iccf icci iccl icfb icll ifaa ifac ifbb ific ifil ifla iiac iica iifa iiii iila ilac ilal ilbc ilca ilia ilic ill- illa illi laaa laac laal laba labi laca lacc laci lacl lafb lafc laff laia laic lail lala lali lall lbcc lbia lcac lcbc lcca lccc lcfc lcia lfca lfcc liac liba libc lica lifa liff lifl liia liii lila lilb lili lill llcc lllc llll