aaaa aaab aaac aaal aaba aabb aabc aabl aabt aaca aacb aacc aacl aaco aact aala aalc aall aalo aaoo aata aatc aatt abaa abab abac abal abat abb- abba abbb abbo abbt abca abcb abcc abcl abct abla ablo aboa abob abol aboo abot abta ac-t acaa acab acac acat acba acbl acca accc acco acct acla aclc acoa acol acot acta actc actl acto actt alaa alac alal alao alat alb- alba albc albo alca alcc alco all- alla alll allo aloa aloc alol aloo alot alta alto aoba aoca aola aotc at-l at-t ataa atab atac atal atat atca atcc atcl atco atla atlo atob atoc atol atot atta atto baaa baal baat baba babb babo bac- baca bacc baco bact bala balc ball balo balt baol bata batc bato batt bbbb bblb bcaa bcat bcbc bcca bccc bccl bctc blaa blab blac blat blbt blob bloc bloo blot boab boac boal boat boba bobb bobo boca boco bola boll bolo bolt boob booc bool boot bota botb boto bott btaa btcc btcl btla btob bttb c-bo caaa caab caac caal caat caba cabo cac- caca cacc caco cala calc call calo calt caol cat- cata catb catc cato catt cbac cbal cbat cbbc cbca cbcc cbcl cbct cblb cblc cbol cbot cbta cbtc cbtl ccaa ccab ccac ccat ccba ccbc ccca cccb cccc cccl ccla cclc ccob ccoc cctb cctc cctl cctt clab clat clob cloo clot cltb cltc coal coat coba cobb cobo coca coco coct col- cola colb coll colo colt coob cool coot cota cotb cotc coto cott ctab ctal ctba ctca ctol ctot ctta laaa laac laal laat laba labo laca lacc lacl laco lact lala lall lalo lata latc lato latt lbcc lcac lcat lcbc lcca lccc lctl lcto llao llat llcc lllc llll lloa lloc lloo loac loat lob- loba lobb lobo loca locc loco lola loll lolo loob looc lool loot lota lotl loto lott ltac ltbl ltcc lttc oall obal obba obbo obla obol obot ocab ocac ocal ocat ocbc occa occc occt oclc oct- octa octo olac olat olba olbo olca olcc olla ollo olot olta ooaa ooba oola oolo oooo ootb otac otcl oto- otoo otta otto taa- taal taat taba tabb tabc tabl tabo taca tacc tacl taco tact tala talc tall talo taoa tata tatb tato tatt tbca tbcb tbcc tbta tcca tccc tctc tlac tlco toab toal toat toba tobo tobt toca toco tol- tola toll tolo tolt tooa tool toot tota totc toto tott ttab ttbb tttt