a-be aaaa aaab aaac aaae aaal aaba aabb aabc aabl aaca aacb aacc aace aacl aaco aaea aaec aala aalc aale aall aalo aaoe aaoo abaa abab abac abae abal abb- abba abbb abbe abbo abca abcb abcc abcl abec abee abel abla able ablo aboa abob abol aboo acaa acab acac acae acba acbl acca accc acce acco ace- acea acec acel acla aclc acle acoa acoe acol aeac aecb aecl aela aelc alaa alac alae alal alao alb- alba albc albe albo alca alcc alce alco alea alec alee aleo all- alla alle alll allo aloa aloc aloe alol aloo aoba aoca aoce aola aole baaa baal baba babb babe babo bac- baca bacc bace baco bael bala balc bale ball balo baol bbbb bbeb bblb bcaa bcbc bcca bccc bccl bcec beal beba bebb bebe bebo beca beeb beel bela bele bell belo beo- blaa blab blac blae blea bleb blee bleo blob bloc bloo boab boac boal boba bobb bobe bobo boca boce boco boea boec boee boel boeo bola bole boll bolo boob booc booe bool c-bo caaa caab caac caal caba cabe cabo cac- caca cacc cace caco caec cala calc cale call calo caol cbac cbal cbbc cbca cbcc cbce cbcl cbea cbec cbee cblb cblc cbol ccaa ccab ccac ccba ccbc ccca cccb cccc cccl ccee ccel ccla cclc ccob ccoc ceac ceal ceba cec- ceca cece ceco ceeb ceec ceel cel- cela celc cele cell celo ceol clab clea clec clee cleo clob cloe cloo coal coba cobb cobe cobo coca coce coco coel col- cola colb cole coll colo coob cool e-cl e-la eaba eaca eacc eaec eala ealc eale ebac ebal ebba ebbc ebbo ebcc ebel ebla eboe ebol eboo ecaa ecac ecal ecao ecbc ecbe ecca eccb eccc ecce eccl ecco ecla eco- ecol eeca eeea eeee eele eeoc el-b elab elac elal elba elbe elbo elca elcb elce elco elea elec elee eleo ella elle ello eola eole eolo laaa laac laal laba labe labo laca lacc lace lacl laco lael lala lale lall lalo lbcc lcac lcbc lcca lccc lcce leaa leal leao leba lebo leca lece leco leea leel lela lele lell lelo leoc llao llcc lllc llll lloa lloc lloo loac lob- loba lobb lobe lobo loca locc loce loco loeb lola lole loll lolo loob looc looe lool o-eo oall obal obba obbo obea obec obel obla oble oboe obol ocab ocac ocal ocbc occa occc oce ocee oclc oec- oeca oecc oeec oela oele olac olba olbo olca olcc ole- olea oleo olla olle ollo ooaa ooba oobe oola oolo oooo