-al -ol a-a a-b a-c a-t aaa aab aac aak aal aao aat ab- aba abb abc abk abl abo abt ac- aca acb acc ack acl aco act aka akb akc akk akl ako al- ala alb alc alk all alo alt aoa aob aoc aok aol aoo aot at- ata atb atc atl ato att baa bab bac bak bal bao bat bba bbb bbc bbk bbl bbo bbt bca bcb bcc bck bcl bco bct bka bkb bkc bkk bkl bko bkt bla blb blc blk bll blo blt boa bob boc bok bol boo bot bta btb btc btk btl bto btt c-- caa cab cac cak cal cao cat cba cbb cbc cbk cbl cbo cbt cca ccb ccc cck ccl cco cct cka ckb ckc cko ckt cl- cla clb clc clk cll clo clt co- coa cob coc cok col coo cot cta ctb ctc ctk ctl cto ctt k-t ka- kaa kab kac kak kal kao kat kba kbb kbc kbk kbl kbo kca kcb kcc kck kcl kct kkb kkc kkk kkl kkt kl- kla klb klc klo klt koa kob koc kok kol koo kot kta ktb ktc ktk ktl kto ktt la- laa lab lac lak lal lao lat lba lbb lbc lbk lbl lbo lbt lca lcb lcc lck lcl lco lct lka lkb lkl lkt lla llb llc llk lll llo llt loa lob loc lok lol loo lot lta ltb ltc ltk ltl lto ltt oaa oab oac oak oal oao oat ob- oba obb obc obk obl obo obt oc- oca ocb occ ock ocl oco oct oka okb okc okk okl oko ola olb olc olk oll olo olt oo- ooa oob ooc ook ool ooo oot ot- ota otb otc otk otl oto ott taa tab tac tak tal tao tat tba tbb tbc tbk tbl tbo tbt tca tcb tcc tck tcl tco tct tka tkb tkc tkk tkl tko tkt tla tlc tlk tll tlo tlt to- toa tob toc tok tol too tot tta ttb ttc ttk ttl tto ttt

a-ak a-ok aaaa aaab aaac aaal aaba aabb aabc aabl aabt aaca aacb aacc aack aacl aaco aact aaka aala aalc aall aalo aaoo aata aatc aatk aatt abaa abab abac abak abal abat abb- abba abbb abbo abbt abca abcb abcc abcl abct abla ablo aboa abob abok 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 akaa akal akao akca akka akko aklo akok akot alaa alac alak alal alao alat alb- alba albc albo alca alcc alco alk- alka alkb alko all- alla alll allo aloa aloc alok alol aloo alot alta alto aoba aoca aola aotc at-l at-t ataa atab atac atak atal atat atca atcc atck atcl atco atka atkt atla atlo atob atoc atok atol atot atta atto baaa baak baal baat baba babb babo bac- baca bacc back baco bact bak- baka bakl bako bakt bala balc balk ball balo balt baol bata batc bato batt bbbb bblb bcaa bcat bcbc bcca bccc bccl bctc blaa blab blac blak blat blbt blkb blob bloc blok bloo blot boab boac boak boal boat boba bobb bobo boca bock boco boka boko bola bolk boll bolo bolt boob booc book bool boot bota botb boto bott btaa btcc btcl btla btob bttb c-bo caaa caab caac caal caat caba cabo cac- caca cacc cack caco caka cala calc calk call calo calt caol cat- cata catb catc cato catt cbac cbal cbat cbbc cbca cbcc cbcl cbct cbka cbkl cbko 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 ckac ckat ckbc ckck ckcl ckco ckoa ckob ckoc ckoo ckot cktb clab clat clob clok cloo clot cltb cltc coak coal coat coba cobb cobo coca cock coco coct cok- coka coko col- cola colb colk coll colo colt coob cook cool coot cota cotb cotc coto cott ctab ctal ctba ctca ctol ctot ctta k-lo kaaa kaab kaak kaal kaat kaba kabb kabc kabo kacb kacc kacl kaco kact kaka kakc kakk kako kakt kala kalb kalc kalk kall kalo kalt kaoa kaoc kaok kaol kat- kata katb katc katk katl kato katt kbaa kbab kbac kbak kbal kbat kbba kbbb kbbc kbbk kbbl kbbo kbbt kbca kbcb kbck kbcl kbco kbct kbkb kbkk kbkl kbko kbla kblb kbll kblo kblt kboa kbob kboc kbok kboo kbot kbta kbtb kbtc kbtk kbtl kbto kbtt kcaa kcab kcac kcal kcat kcba kcbc kcbk kcbl kcca kccb kccc kcck kccl kcct kckc kckk kckl kcko kcla kclc kclk kcll kclt kcob kcol kcot kcta kctb kctc kcto kkaa kkac kkal kkat kkba kkbb kkbl kkbo kkbt kkcb kkck kkcl kkco kkct kkkk kklb kklc kkll kklo kkoa kkob kkol kkoo kkot kktc kktk kktl klaa klab klac klak klal klat klbb klbc klbl klbt klca klcb klcc klck klcl klka klkc klkk klkl klko klla kllb kllc kllk kloa klob kloc klok klol kloo kltc kltk klto kltt koab koac koak koal koba kobb kobc kobk kobo koca kocb kock koct koka kokb kokc kokk koko kola kolb kolc kolk koll kolo kolt koob kooc kook kool kooo koot kota kotb kotc kotk koto kott ktaa ktak ktal ktao ktat ktba ktbb ktbc ktbl ktbt ktcc ktck ktcl ktco ktkb ktkc ktkk ktko ktkt ktla ktlb ktlk ktlo ktlt ktob ktoc ktok ktoo ktot kttc kttk ktto kttt laaa laac laak laal laat laba labo laca lacc lack lacl laco lact laka lala lall lalo lata latc lato latt lbcc lcac lcat lcbc lcca lccc lctl lcto lkab lkal llao llat llcc lllc llll lloa lloc lloo loac loat lob- loba lobb lobo loca locc lock loco loka lokk loko lola loll lolo loob looc look lool loot lota lotl loto lott ltac ltbl