a-be aaaa aaab aaac aaae aaal aaba aabb aabc aabl aaca aacb aacc aace aacl aaea aaec aala aalc aale aall abaa abab abac abae abal abax abb- abba abbb abbe abca abcb abcc abcl abec abee abel abla able acaa acab acac acae acba acbl acca accc acce ace- acea acec acel acla aclc acle aeac aecb aecl aela aelc alaa alac alae alal alb- alba albc albe alca alcc alce alea alec alee alex all- alla alle alll alxa axal axce axel axle ba-x baaa baal baba babb babe bac- baca bacc bace bael bala balc bale ball bbbb bbeb bblb bcaa bcbc bcca bccc bccl bcec beal beba bebb bebe beca beeb beel bela bele bell blaa blab blac blae blea bleb blee caaa caab caac caal caba cabe cac- caca cacc cace caec caex cala calc cale call calx caxa cbac cbal cbax cbbc cbca cbcc cbce cbcl cbea cbec cbee cblb cblc cbxa ccaa ccab ccac ccba ccbc ccca cccb cccc cccl ccee ccel ccla cclc cclx ccxl ceac ceal ceba cec- ceca cece ceeb ceec ceel cel- cela celc cele cell cexe clab clea clec clee clxx cxxx e-cl e-la eaba eaca eacc eaec eala ealc eale eaxl ebac ebal ebba ebbc ebcc ebel ebla ecaa ecac ecal ecbc ecbe ecca eccb eccc ecce eccl ecla eeca eeea eeee eele el-b elab elac elal elba elbe elca elcb elce elea elec elee elex ella elle exa- excl exec exel laaa laac laal laax laba labe laca lacc lace lacl lael lala lale lall laxa laxe lbcc lcac lcbc lcca lccc lcce leaa leal leba leca lece leea leel lela lele lell lexa lexx llcc lllc llll lxxx xace xacl xala xall xbee xbel xcal xcbl xcel xela xexe xxxx