a-a a-b a-c a-t aaa aab aac aan aar aas aat aau ab- aba abb abc abn abr abs abt abu ac- aca acb acc acn acr acs act acu an- ana anb anc ann anr ans ant anu ar- ara arb arc arn arr ars art aru as- asa asb asc asn asr ass ast asu at- ata atb atc atn atr ats att atu au- aua aub auc aun aur aus aut b-u baa bab bac ban bar bas bat bau bba bbb bbc bbn bbr bbs bbt bbu bca bcb bcc bcn bcr bcs bct bcu bna bnb bnc bnn bnr bns bnt bnu bra brb brn brr brs brt bru bsa bsb bsc bsn bsr bss bst bsu bta btb btc btn btr bts btt btu bua bub buc bun bur bus but buu c-- caa cab cac can car cas cat cau cba cbb cbc cbn cbr cbs cbt cbu cca ccb ccc ccn ccr ccs cct ccu cn- cna cnb cnc cnn cnr cns cnt cnu cra crb crc crn crr crs crt cru csa csb csc csn csr css cst csu cta ctb ctc ctn ctr cts ctt ctu cua cub cuc cun cur cus cut cuu naa nab nac nan nar nas nat nau nba nbb nbc nbn nbr nbs nbt nbu nca ncb ncc ncn ncr ncs nct ncu nna nnb nnc nnn nns nnt nnu nra nrb nrc nrn nrr nrs nrt nru nsa nsb nsc nsn nsr nss nst nsu nta ntb ntc ntn ntr nts ntt ntu nua nub nuc nun nur nus nut nuu ra- raa rab rac ran rar ras rat rau rba rbb rbc rbn rbr rbs rbt rbu rca rcb rcc rcn rcr rcs rct rcu rna rnb rnc rnn rnr rns rnt rnu rra rrb rrc rrn rrr rrs rrt rru rsa rsb rsc rsn rsr rss rst rsu rta rtb rtc rtn rtr rts rtt rtu rua rub ruc run rur rus rut ruu saa sab sac san sar sas sat sau sba sbb sbc sbn sbr sbs sbt sbu sca scb scc scn scr scs sct scu sna snb snc snn snr sns snt snu sr- sra srb src srn srr srs srt ss- ssa ssb ssc ssn ssr sss sst ssu sta stb stc stn str sts stt stu sua sub suc sun sur sus sut suu taa tab tac tan tar tas tat tau tba tbb tbc tbn tbr tbs tbt tbu tca tcb tcc tcn tcr tcs tct tcu tna tnb tnc tnn tnr tns tnt tra trb trc trn trr trs trt tru tsa tsb tsc tsn tsr tss tst tsu tta ttb ttc ttn ttr tts ttt ttu tua tub tuc tun tur tus tut tuu ua- uaa uab uac uan uar uas uat uau uba ubb ubc ubn ubr ubs ubt ubu uca ucb ucc ucn ucr ucs uct ucu un- una unb unc unn unr uns unt unu ur- ura urb urc urn urr urs urt uru usa usb usc usn usr uss ust usu uta utb utc utn utr uts utt utu uua uuc uun uur uus uut uuu