a-be aaaa aaab aaac aaad aaae aaaf aaal aaba aabb aabc aabd aabl aaca aacb aacc aacd aace aacf aacl aada aadc aade aaea aaec aafa aafb aafc aafd aaff aafl aala aalc aald aale aall abaa abab abac abad abae abaf abal abb- abba abbb abbe abca abcb abcc abcd abcf abcl abda abec abed abee abel abff abla able acaa acab acac acad acae acba acbl acca accc accd acce accf acda acdb acdc acde acdf ace- acea acec aced acel acfc acfd acfe acfl acla aclc acle adaa adab adac adad adae adal adba adbc adcc adda addc addd adde addl adea adeb adee adel adfa adfc adfl adle aeac aeaf aecb aecl aede aela aelc afaa afad afca afcb afcc afdb afdc afdl afee afel affa affc afla aflc afle alaa alac alad alae alal alb- alba albc albe alca alcc alce ald- alda alde aldl alea alec aled alee alef alfa alfe all- alla alle alll baaa baad baaf baal baba babb babe bac- baca bacc bace bada badb badd bade baed bael bafc baff bala balc bald bale balf ball bbad bbbb bbdd bbeb bbfc bblb bcaa bcbc bcca bccc bccl bcda bcde bcec bcfc bdbc bddc bdle bead beaf beal beba bebb bebe beca beda bede bedl beeb beed beef beel befa befe beff bela beld bele bell bfca bffl blaa blab blac blad blae bldc blea bleb bled blee blfc c-cd caaa caab caac caaf caal caba cabe cabf cac- caca cacc cace cada cadc cadd cade caec cafa cafb cafc cafe caff cafl cala calc cald cale calf call cbac cbal cbbc cbca cbcc cbce cbcl cbdb cbdc cbea cbec cbee cbef cbfb cbfc cblb cblc ccaa ccab ccac ccad ccaf ccba ccbc ccca cccb cccc cccf cccl ccdc ccdf cced ccee ccel ccfa ccfc ccfd ccff ccfl ccla cclc cd-e cdaa cdac cdad cdba cdbf cdda cddb cddl cdec cdef cdfa cdfe ceac cead ceal ceba cec- ceca cece ceda cedd cede ceeb ceec ceel cef- cefa cefc cel- cela celc cele celf cell cfaa cfab cfac cfae cfbc cfca cfcb cfcf cfcl cfda cffb clab clad claf clcd cldc clea clec cled clee clef daab daad daae daal daba dabb daca dace dada dade daeb dafa dafc dafe daff dala dale dalf dall dbcc dbfc dcbc dcca dccb dccc dccl dcdb dcfc dddd ddlc deac dead deae deaf deal deba debe dec- deca decc decd dece decl deda dedd dede deeb deed deef deel defe deff dela deld dele delf dell dfaf dfcc dffa dlab dlbd e-cl e-la eaaf eaba eaca eacc eada eadb eadd eaec eafb eala ealc eald eale ebac ebal ebba ebbc ebcc ebed ebel ebfc ebla ecaa ecac ecad ecal ecbc ecbe ecca eccb eccc ecce eccl ecdc ecdf ecdl eced ecef ecfa ecfc ecla edac edad edca edda eddc edde ede- edea edel edfa edfl edla edle eeca eede eeea eeee eefa eefe eefl eele efab efca efda effa efla el-b elab elac elad elal elba elbe elca elcb elce elda elde elea elec eled elee elef elfa elfc elfe ella elle faaa faac faad faba fabd fabe faca facc face fada fadd fade faeb fafa fafc fafe faff fala falc fald fale fall fbla fble fcab fcal fcba fcca fccf fcda fdca fead feaf feal feba fece feda fede feeb feed feel fefc fefe feff fela feld fele felf fell ffcc ffee ffff flab flac flad flae flcl flea fled flee laaa laac laad laal laba labe laca lacc lace lacl lada ladd lade lael lafb lafc lafe laff lala lald lale lall lbcc lcac lcad lcbc lcca lccc lcce lcdd lcfc ldcf leaa lead leaf leal leba lebd leca lece leda lede leea leed leef leel lefa lefe leff lela lele lell lfca lfcc llcc lldb lldc llef lllc llll