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 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 all- alla alle alll 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 cala calc cale call cbac cbal cbbc cbca cbcc cbce cbcl cbea cbec cbee cblb cblc ccaa ccab ccac ccba ccbc ccca cccb cccc cccl ccee ccel ccla cclc ceac ceal ceba cec- ceca cece ceeb ceec ceel cel- cela celc cele cell clab clea clec clee e-cl e-la eaba eaca eacc eaec eala ealc eale 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 ella elle laaa laac laal laba labe laca lacc lace lacl lael lala lale lall lbcc lcac lcbc lcca lccc lcce leaa leal leba leca lece leea leel lela lele lell llcc lllc llll