a-a a-b a-c a-t aaa aab aac aaj aak aao aas aat ab- aba abb abc abj abk abo abs abt ac- aca acb acc acj ack aco acs act aja ajb ajc ajj ajk ajo ajs ajt aka akb akc akj akk ako aks aoa aob aoc aoj aok aoo aos aot as- asa asb asc asj ask aso ass ast at- ata atb atc ato ats att baa bab bac baj bak bao bas bat bba bbb bbc bbk bbo bbs bbt bca bcb bcc bcj bck bco bcs bct bja bjc bjj bjk bjs bjt bka bkb bkc bkk bko bks bkt boa bob boc boj bok boo bos bot bsa bsb bsc bsj bsk bso bss bst bta btb btc btk bto bts btt c-- c-j caa cab cac caj cak cao cas cat cba cbb cbc cbj cbk cbo cbs cbt cca ccb ccc ccj cck cco ccs cct cja cjb cjc cjk cjs cka ckb ckc cko cks ckt co- coa cob coc coj cok coo cos cot csa csb csc csj csk cso css cst cta ctb ctc ctk cto cts ctt jaa jab jac jaj jak jao jas jat jba jbc jbj jbk jbo jbs jbt jca jcb jcc jck jco jcs jct jja jjb jjc jjj jjk jjs jka jkb jkk jko jks jkt joa job joc joj jok joo jos jot jsa jsb jsc jsj jsk jso jss jst jta jtb jtc jtk jts jtt k-t ka- kaa kab kac kaj kak kao kas kat kba kbb kbc kbk kbo kbs kca kcb kcc kck kcs kct kjb kjc kjs kkb kkc kkk kks kkt koa kob koc kok koo kos kot ksa ksb ksc ksk kso kss kst kta ktb ktc ktj ktk kto kts ktt oaa oab oac oaj oak oao oas oat ob- oba obb obc obj obk obo obs obt oc- oca ocb occ ocj ock oco ocs oct oja ojb ojc ojo ojs oka okb okc okj okk oko oks oo- ooa oob ooc ook ooo oos oot os- osa osb osc osj osk oso oss ost ot- ota otb otc otk oto ots ott saa sab sac saj sak sao sas sat sba sbb sbc sbj sbk sbo sbs sbt sca scb scc scj sck sco scs sct sja sjb sjc sjj sjk sjs sjt sk- ska skb skc skj skk sko sks skt soa sob soc soj sok soo sos sot ss- ssa ssb ssc ssj ssk sso sss sst sta stb stc stj stk sto sts stt taa tab tac taj tak tao tas tat tba tbb tbc tbj tbk tbo tbs tbt tca tcb tcc tcj tck tco tcs tct tjc tjo tjs tka tkb tkc tkk tko tks tkt to- toa tob toc toj tok too tos tot tsa tsb tsc tsj tsk tso tss tst tta ttb ttc ttk tto tts ttt