a-a a-b a-c a-t aaa aab aac aak aao aar aas aat aau ab- aba abb abc abk abo abr abs abt abu ac- aca acb acc ack aco acr acs act acu aka akb akc akk ako akr aks aku aoa aob aoc aok aoo aor aos aot aou ar- ara arb arc ark aro arr ars art aru as- asa asb asc ask aso asr ass ast asu at- ata atb atc ato atr ats att atu au- aua aub auc auk auo aur aus aut b-u baa bab bac bak bao bar bas bat bau bba bbb bbc bbk bbo bbr bbs bbt bbu bca bcb bcc bck bco bcr bcs bct bcu bka bkb bkc bkk bko bkr bks bkt boa bob boc bok boo bor bos bot bou bra brb brk bro brr brs brt bru bsa bsb bsc bsk bso bsr bss bst bsu bta btb btc btk bto btr bts btt btu bua bub buc buk buo bur bus but buu c-- caa cab cac cak cao car cas cat cau cba cbb cbc cbk cbo cbr cbs cbt cbu cca ccb ccc cck cco ccr ccs cct ccu cka ckb ckc cko cks ckt co- coa cob coc cok coo cor cos cot cou cra crb crc crk cro crr crs crt cru csa csb csc csk cso csr css cst csu cta ctb ctc ctk cto ctr cts ctt ctu cua cub cuc cuk cuo cur cus cut cuu k-t ka- kaa kab kac kak kao kar kas kat kau kba kbb kbc kbk kbo kbr kbs kbu kca kcb kcc kck kcr kcs kct kcu kkb kkc kkk kkr kks kkt kku koa kob koc kok koo kor kos kot kou kra krc krk kro krr krs krt kru ksa ksb ksc ksk kso ksr kss kst ksu kta ktb ktc ktk kto ktr kts ktt ktu kub kuc kuk kur kus kut kuu oaa oab oac oak oao oar oas oat oau ob- oba obb obc obk obo obr obs obt obu oc- oca ocb occ ock oco ocr ocs oct ocu oka okb okc okk oko okr oks oku oo- ooa oob ooc ook ooo oor oos oot or- ora orb orc ork oro orr ors ort oru os- osa osb osc osk oso osr oss ost osu ot- ota otb otc otk oto otr ots ott otu ou- oua ouc ouk ouo our ous out ra- raa rab rac rak rao rar ras rat rau rba rbb rbc rbk rbo rbr rbs rbt rbu rca rcb rcc rco rcr rcs rct rcu rkb rkc rkk rko rks rkt rku roa rob roc rok roo ror ros rot rou rra rrb rrc rrk rrr rrs rrt rru rsa rsb rsc rsk rso rsr rss rst rsu rta rtb rtc rtk rto rtr rts rtt rtu rua rub ruc ruk ruo rur rus rut ruu saa sab sac sak sao sar sas sat sau sba sbb sbc sbk sbo sbr sbs sbt sbu sca scb scc sck sco scr scs sct scu sk- ska skb skc skk sko skr sks skt sku soa sob soc sok soo sor sos sot sou sr- sra srb src srk sro srr srs srt ss- ssa ssb ssc ssk sso ssr sss sst ssu sta stb stc stk sto str sts stt stu sua sub suc suk suo sur sus sut suu taa tab tac tak tao tar tas tat tau tba tbb tbc tbk tbo tbr tbs tbt tbu tca tcb tcc tck tco tcr tcs tct tcu tka tkb tkc tkk tko tkr tks tkt to- toa tob toc tok too tor tos tot tou tra trb trc trk tro trr trs trt tru tsa tsb tsc tsk tso tsr tss tst tsu tta ttb ttc ttk tto ttr tts ttt ttu tua tub tuc tuk tuo tur tus tut tuu ua- uaa uab uac uak uao uar uas uat uau uba ubb ubc ubk ubo ubr ubs ubt ubu uca ucb ucc uck uco ucr ucs uct ucu uka ukb ukc ukk ukr uku uoa uob uoc uok uoo uor uos uot ur- ura urb urc urk uro urr urs urt uru usa usb usc usk uso usr uss ust usu uta utb utc utk uto utr uts utt utu uua uuc uur uus uut uuu