-al -ol a-a a-b a-c a-t aaa aab aac aak aal aao aar aas aat ab- aba abb abc abk abl abo abr abs abt ac- aca acb acc ack acl aco acr acs act aka akb akc akk akl ako akr aks al- ala alb alc alk all alo alr als alt aoa aob aoc aok aol aoo aor aos aot ar- ara arb arc ark arl aro arr ars art as- asa asb asc ask asl aso asr ass ast at- ata atb atc atl ato atr ats att baa bab bac bak bal bao bar bas bat bba bbb bbc bbk bbl bbo bbr bbs bbt bca bcb bcc bck bcl bco bcr bcs bct bka bkb bkc bkk bkl bko bkr bks bkt bla blb blc blk bll blo blr bls blt boa bob boc bok bol boo bor bos bot bra brb brk brl bro brr brs brt bsa bsb bsc bsk bsl bso bsr bss bst bta btb btc btk btl bto btr bts btt c-- caa cab cac cak cal cao car cas cat cba cbb cbc cbk cbl cbo cbr cbs cbt cca ccb ccc cck ccl cco ccr ccs cct cka ckb ckc cko cks ckt cl- cla clb clc clk cll clo clr cls clt co- coa cob coc cok col coo cor cos cot cra crb crc crk crl cro crr crs crt csa csb csc csk csl cso csr css cst cta ctb ctc ctk ctl cto ctr cts ctt k-t ka- kaa kab kac kak kal kao kar kas kat kba kbb kbc kbk kbl kbo kbr kbs kca kcb kcc kck kcl kcr kcs kct kkb kkc kkk kkl kkr kks kkt kl- kla klb klc klo klr kls klt koa kob koc kok kol koo kor kos kot kra krc krk krl kro krr krs krt ksa ksb ksc ksk ksl kso ksr kss kst kta ktb ktc ktk ktl kto ktr kts ktt la- laa lab lac lak lal lao lar las lat lba lbb lbc lbk lbl lbo lbr lbs lbt lca lcb lcc lck lcl lco lcr lcs lct lka lkb lkl lkr lks lkt lla llb llc llk lll llo llr lls llt loa lob loc lok lol loo lor los lot lra lrb lrc lrk lro lrr lrs lrt lsa lsb lsc lsk lsl lso lsr lss lst lta ltb ltc ltk ltl lto ltr lts ltt oaa oab oac oak oal oao oar oas oat ob- oba obb obc obk obl obo obr obs obt oc- oca ocb occ ock ocl oco ocr ocs oct oka okb okc okk okl oko okr oks ola olb olc olk oll olo ols olt oo- ooa oob ooc ook ool ooo oor oos oot or- ora orb orc ork orl oro orr ors ort os- osa osb osc osk osl oso osr oss ost ot- ota otb otc otk otl oto otr ots ott ra- raa rab rac rak ral rao rar ras rat rba rbb rbc rbk rbl rbo rbr rbs rbt rca rcb rcc rcl rco rcr rcs rct rkb rkc rkk rko rks rkt rla rlc rll rlo rlr rls rlt roa rob roc rok rol roo ror ros rot rra rrb rrc rrk rrl rrr rrs rrt rsa rsb rsc rsk rsl rso rsr rss rst rta rtb rtc rtk rtl rto rtr rts rtt saa sab sac sak sal sao sar sas sat sba sbb sbc sbk sbl sbo sbr sbs sbt sca scb scc sck scl sco scr scs sct sk- ska skb skc skk skl sko skr sks skt sla slb slc slk sll slo slr sls slt soa sob soc sok sol soo sor sos sot sr- sra srb src srk srl sro srr srs srt ss- ssa ssb ssc ssk ssl sso ssr sss sst sta stb stc stk stl sto str sts stt taa tab tac tak tal tao tar tas tat tba tbb tbc tbk tbl tbo tbr tbs tbt tca tcb tcc tck tcl tco tcr tcs tct tka tkb tkc tkk tkl tko tkr tks tkt tla tlc tlk tll tlo tlr tls tlt to- toa tob toc tok tol too tor tos tot tra trb trc trk trl tro trr trs trt tsa tsb tsc tsk tsl tso tsr tss tst tta ttb ttc ttk ttl tto ttr tts ttt

a-ak a-ok aaaa aaab aaac aaal aaar aaas aaba aabb aabc aabl aabt aaca aacb aacc aack aacl aaco aacr aacs aact aaka aala aalc aall aalo aals aaoo aara aarc aaro aars aart aasa aasc aass aast aata aatc aatk aatt abaa abab abac abak abal abar abas abat abb- abba abbb abbo abbr abbs abbt abca abcb abcc abcl abcr abcs abct abla ablo abls aboa abob abok abol aboo abor abos abot abra abrc abro abrs abs- absa absl abss abta abts ac-t acaa acab acac acar acas acat acba acbl acca accc acco accs acct acks acla aclc aclr acls acoa acol acor acos acot acr- acra acrc acro acrr acrs acsa acsc acsl acss acst acta actc actl acto acts actt akaa akal akao akar akas akca akka akko aklo akok akos akot akr- akra aksa akst alaa alac alak alal alao alar alas alat alb- alba albc albo albs alca alcc alco alcs alk- alka alkb alko all- alla alll allo allr alls aloa aloc alok alol aloo alor alos alot alro alsa alsc also alst alta alto alts aoba aoca aocs aoks aola aora aorb aors aort aoss aotc arab arac arak aral arar aras arat arba arbs arc- arca arco arcs arct arka arko arks arla arlo aroa arob aroo aror aros arr- arra arrc arrk arro arrr arrs arrt ars- arsa arsc arsk arso arst arta artc arto artr arts asaa asab asac asak asal asao asar asas asat asba asbo asc- asca ascb ascc ascl asco ascr asct aska asko askr asks askt asla aslo aslr asob asoc