aaaa aaab aaac aaal aaba aabb aabc aabl aabt aaca aacb aacc aacl aact aala aalc aall aata aatc aatt abaa abab abac abal abat abb- abba abbb abbt abca abcb abcc abcl abct abla abta ac-t acaa acab acac acat acba acbl acca accc acct acla aclc acta actc actl actt alaa alac alal alat alb- alba albc alca alcc all- alla alll alta at-l at-t ataa atab atac atal atat atca atcc atcl atla atta baaa baal baat baba babb bac- baca bacc bact bala balc ball balt bata batc batt bbbb bblb bcaa bcat bcbc bcca bccc bccl bctc blaa blab blac blat blbt btaa btcc btcl btla bttb caaa caab caac caal caat caba cac- caca cacc cala calc call calt cat- cata catb catc catt cbac cbal cbat cbbc cbca cbcc cbcl cbct cblb cblc cbta cbtc cbtl ccaa ccab ccac ccat ccba ccbc ccca cccb cccc cccl ccla cclc cctb cctc cctl cctt clab clat cltb cltc ctab ctal ctba ctca ctta laaa laac laal laat laba laca lacc lacl lact lala lall lata latc latt lbcc lcac lcat lcbc lcca lccc lctl llat llcc lllc llll ltac ltbl ltcc lttc taa- taal taat taba tabb tabc tabl taca tacc tacl tact tala talc tall tata tatb tatt tbca tbcb tbcc tbta tcca tccc tctc tlac ttab ttbb tttt