a-a a-b a-c a-t aaa aab aac aak aan aar aas aat aau ab- aba abb abc abk abn abr abs abt abu ac- aca acb acc ack acn acr acs act acu aka akb akc akk akn akr aks aku an- ana anb anc ank ann anr ans ant anu ar- ara arb arc ark arn arr ars art aru as- asa asb asc ask asn asr ass ast asu at- ata atb atc atn atr ats att atu au- aua aub auc auk aun aur aus aut b-u baa bab bac bak ban bar bas bat bau bba bbb bbc bbk bbn bbr bbs bbt bbu bca bcb bcc bck bcn bcr bcs bct bcu bka bkb bkc bkk bkn bkr bks bkt bna bnb bnc bnk bnn bnr bns bnt bnu bra brb brk brn brr brs brt bru bsa bsb bsc bsk bsn bsr bss bst bsu bta btb btc btk btn btr bts btt btu bua bub buc buk bun bur bus but buu c-- caa cab cac cak can car cas cat cau cba cbb cbc cbk cbn cbr cbs cbt cbu cca ccb ccc cck ccn ccr ccs cct ccu cka ckb ckc cks ckt cn- cna cnb cnc cnn cnr cns cnt cnu cra crb crc crk crn crr crs crt cru csa csb csc csk csn csr css cst csu cta ctb ctc ctk ctn ctr cts ctt ctu cua cub cuc cuk cun cur cus cut cuu k-t ka- kaa kab kac kak kan kar kas kat kau kba kbb kbc kbk kbn kbr kbs kbu kca kcb kcc kck kcn kcr kcs kct kcu kkb kkc kkk kkn kkr kks kkt kku kn- kna knc knk knn knr knt knu kra krc krk krn krr krs krt kru ksa ksb ksc ksk ksn ksr kss kst ksu kta ktb ktc ktk ktn ktr kts ktt ktu kub kuc kuk kun kur kus kut kuu naa nab nac nak nan nar nas nat nau nba nbb nbc nbk nbn nbr nbs nbt nbu nca ncb ncc nck ncn ncr ncs nct ncu nka nkc nkk nkn nkr nks nkt nku nna nnb nnc nnk nnn nns nnt nnu nra nrb nrc nrk nrn nrr nrs nrt nru nsa nsb nsc nsk nsn nsr nss nst nsu nta ntb ntc ntk ntn ntr nts ntt ntu nua nub nuc nuk nun nur nus nut nuu ra- raa rab rac rak ran rar ras rat rau rba rbb rbc rbk rbn rbr rbs rbt rbu rca rcb rcc rcn rcr rcs rct rcu rkb rkc rkk rks rkt rku rna rnb rnc rnn rnr rns rnt rnu rra rrb rrc rrk rrn rrr rrs rrt rru rsa rsb rsc rsk rsn rsr rss rst rsu rta rtb rtc rtk rtn rtr rts rtt rtu rua rub ruc ruk run rur rus rut ruu saa sab sac sak san sar sas sat sau sba sbb sbc sbk sbn sbr sbs sbt sbu sca scb scc sck scn scr scs sct scu sk- ska skb skc skk skr sks skt sku sna snb snc snk snn snr sns snt snu sr- sra srb src srk srn srr srs srt ss- ssa ssb ssc ssk ssn ssr sss sst ssu sta stb stc stk stn str sts stt stu sua sub suc suk sun sur sus sut suu taa tab tac tak tan tar tas tat tau tba tbb tbc tbk tbn tbr tbs tbt tbu tca tcb tcc tck tcn tcr tcs tct tcu tka tkb tkc tkk tkr tks tkt tna tnb tnc tnk tnn tnr tns tnt tra trb trc trk trn trr trs trt tru tsa tsb tsc tsk tsn tsr tss tst tsu tta ttb ttc ttk ttn ttr tts ttt ttu tua tub tuc tuk tun tur tus tut tuu ua- uaa uab uac uak uan uar uas uat uau uba ubb ubc ubk ubn ubr ubs ubt ubu uca ucb ucc uck ucn ucr ucs uct ucu uka ukb ukc ukk ukn ukr uku un- una unb unc unk unn unr uns unt unu ur- ura urb urc urk urn urr urs urt uru usa usb usc usk usn usr uss ust usu uta utb utc utk utn utr uts utt utu uua uuc uun uur uus uut uuu