aaaa aaab aaac aaal aaam aaba aabb aabc aabl aabm aabt aaca aacb aacc aacl aacm aact aala aalc aall aama aamb aamc aata aatc aatt abaa abab abac abal abam abat abb- abba abbb abbt abca abcb abcc abcl abct abla abma abmb abmc abmt abta ac-t acaa acab acac acat acba acbl acca accc accm acct acla aclc acma acmc acta actc actl actt alaa alac alal alam alat alb- alba albc albm alca alcc all- alla alll alma almc alta altm amaa amac amal amam amat amb- amba amca amcc amla amm- amma amta amtc at-l at-t ataa atab atac atal atat atca atcc atcl atla atm- atma atml atta baaa baal baam baat baba babb babm bac- baca bacc bact bala balc ball balm balt bama bamb bamc baml bamm bata batc batt bbbb bbcm bblb bcaa bcam bcat bcbc bcca bccc bccl bccm bcma bctc blaa blab blac blam blat blbt bmaa bmtc btaa btcc btcl btla bttb caaa caab caac caal caam caat caba cac- caca cacc cacm cala calc call calm calt cama camb camc caml camm camt cat- cata catb catc catm catt cbac cbal cbat cbbc cbca cbcc cbcl cbcm cbct cblb cblc cbta cbtc cbtl ccaa ccab ccac ccam ccat ccba ccbc ccca cccb cccc cccl cccm ccla cclc cclm ccma ccmb ccmc ccmm cctb cctc cctl cctt clab clam clat cltb cltc cmaa cmac cmba cmbc cmcc cmla cmll cmmb cmmc cmml cmta cmtc ctab ctal ctba ctca ctma ctta laaa laac laal laam laat laba laca lacc lacl lact lala lall lalm lama lamb lamm lata latc latt lbcc lbmc lcac lcat lcbc lcca lccc lccm lctl lctm llat llcc lllc llll lmcc ltac ltbl ltcc lttc maaa maac maal maam maat maba mac- maca macb macc mact mal- mala mall malm malt mama mamc mata matc matl matt mbac mbam mbba mbca mbta mcaa mcac mcat mcba mcbc mcca mccc mccl mcla mclt mcmc mcml mcmt mctc mlab mlat mlba mlcc mltb mmaa mmab mmac mmcc mmcl mmcm mmct mmmc mmmm mtaa mtab mtac mtbc mtlb taa- taal taat taba tabb tabc tabl taca tacc tacl tact tala talc tall talm tama tamc tamm tata tatb tatt tbca tbcb tbcc tbta tcam tcca tccc tctc tlac tlma tmaa tmac tmbc tmca tmcc tmcm tmtt ttab ttbb ttma ttml tttt