bbbb bbeb bbet bblb bcbc bccc bccl bcec bcet bctc bebb bebe beeb beel beet bele bell belt betc bete bett blbt bleb blee blet btcc btcl btec bttb cbbc cbcc cbce cbcl cbct cbec cbee cbet cblb cblc cbtc cbtl ccbc cccb cccc cccl ccee ccel cclc cctb cctc cctl cctt cec- cece cect ceeb ceec ceel cel- celc cele cell celt cet- cete clec clee clet cltb cltc ctec ctle e-cl ebbc ebcc ebel ecbc ecbe eccb eccc ecce eccl ecct eclt ect- ectc eeee eele eetc eete el-b elbe elcb elce elec elee elet elle elte etbc etcc etec etee etel ette lbcc lcbc lccc lcce lctl lece lect leel leet lele lell lete lett llcc llet lllc llll ltbl ltcc ltee lttc tbcb tbcc tbce tccc tctc tecl tect teec teel teet tel- telc tele tell telt tete tett ttbb tttt