a-be aaaa aaab aaac aaad aaae aaal aaba aabb aabc aabd aabl aaca aacb aacc aacd aace aacl aada aadc aade aaea aaec aala aalc aald aale aall abaa abab abac abad abae abal abax abb- abba abbb abbe abca abcb abcc abcd abcl abda abec abed abee abel abla able acaa acab acac acad acae acba acbl acca accc accd acce acda acdb acdc acde ace- acea acec aced acel acla aclc acle adaa adab adac adad adae adal adba adbc adcc adda addc addd adde addl adea adeb adee adel adle aeac aecb aecl aede aela aelc alaa alac alad alae alal alb- alba albc albe alca alcc alce ald- alda alde aldl alea alec aled alee alex all- alla alle alll alxa axal axce axed axel axle ba-x baaa baad baal baba babb babe bac- baca bacc bace bada badb badd bade baed bael bala balc bald bale ball bbad bbbb bbdd bbeb bblb bcaa bcbc bcca bccc bccl bcda bcde bcec bdbc bddc bdle bead beal beba bebb bebe beca beda bede bedl beeb beed beel bela beld bele bell blaa blab blac blad blae bldc blea bleb bled blee c-cd caaa caab caac caal caba cabe cac- caca cacc cace cada cadc cadd cade caec caex cala calc cald cale call calx caxa cbac cbal cbax cbbc cbca cbcc cbce cbcl cbdb cbdc cbea cbec cbee cblb cblc cbxa ccaa ccab ccac ccad ccba ccbc ccca cccb cccc cccl ccdc cced ccee ccel ccla cclc cclx ccxl cd-e cdaa cdac cdad cdax cdba cdda cddb cddl cdec cdex cdxl ceac cead ceal ceba cec- ceca cece ceda cedd cede ceeb ceec ceel cel- cela celc cele cell cexe clab clad clcd cldc clea clec cled clee clxx cxxx daab daad daae daal daba dabb daca dace dada dade daeb dala dale dall dbcc dcbc dcca dccb dccc dccl dcdb dcxl dcxx dddd ddlc deac dead deae deal deba debe dec- deca decc decd dece decl deda dedd dede deeb deed deel dela deld dele dell dex- dexa dexe dlab dlbd dxab dxbc dxbe dxbl dxcb dxcc dxcl dxdc dxec dxed dxel dxll dxxl dxxx e-cl e-la eaba eaca eacc eada eadb eadd eaec eala ealc eald eale eaxl ebac ebal ebba ebbc ebcc ebed ebel ebla ecaa ecac ecad ecal ecbc ecbe ecca eccb eccc ecce eccl ecdc ecdl eced ecla edac edad edax edca edda eddc edde ede- edea edel edex edla edle edxl eeca eede eeea eeee eele el-b elab elac elad elal elba elbe elca elcb elce elda elde elea elec eled elee elex ella elle exa- excl exda exec exed exel laaa laac laad laal laax laba labe laca lacc lace lacl lada ladd lade lael lala lald lale lall laxa laxe lbcc lcac lcad lcbc lcca lccc lcce lcdd leaa lead leal leba lebd leca lece leda lede leea leed leel lela lele lell lexa lexx llcc lldb lldc lllc llll lxde lxxx x-ed xace xacl xala xall xbcd xbee xbel xcal xcbl xcel xdcc xela xexe xldb xxxx