a-a a-b a-t aaa aab aan aao aar aas aat aau ab- aba abb abn abo abr abs abt abu an- ana anb ann ano anr ans ant anu aoa aob aon aoo aor aos aot aou ar- ara arb arn aro arr ars art aru as- asa asb asn aso asr ass ast asu at- ata atb atn ato atr ats att atu au- aua aub aun auo aur aus aut b-u baa bab ban bao bar bas bat bau bba bbb bbn bbo bbr bbs bbt bbu bna bnb bnn bno bnr bns bnt bnu boa bob bon boo bor bos bot bou bra brb brn bro brr brs brt bru bsa bsb bsn bso bsr bss bst bsu bta btb btn bto btr bts btt btu bua bub bun buo bur bus but buu naa nab nan nao nar nas nat nau nba nbb nbn nbo nbr nbs nbt nbu nna nnb nnn nno nns nnt nnu no- noa nob non noo nor nos not nou nra nrb nrn nro nrr nrs nrt nru nsa nsb nsn nso nsr nss nst nsu nta ntb ntn nto ntr nts ntt ntu nua nub nun nuo nur nus nut nuu oaa oab oan oao oar oas oat oau ob- oba obb obn obo obr obs obt obu on- ona onb onn ono onr ons ont onu oo- ooa oob oon ooo oor oos oot or- ora orb orn oro orr ors ort oru os- osa osb osn oso osr oss ost osu ot- ota otb otn oto otr ots ott otu ou- oua oun ouo our ous out ra- raa rab ran rao rar ras rat rau rba rbb rbn rbo rbr rbs rbt rbu rna rnb rnn rno rnr rns rnt rnu roa rob ron roo ror ros rot rou rra rrb rrn rrr rrs rrt rru rsa rsb rsn rso rsr rss rst rsu rta rtb rtn rto rtr rts rtt rtu rua rub run ruo rur rus rut ruu saa sab san sao sar sas sat sau sba sbb sbn sbo sbr sbs sbt sbu sna snb snn sno snr sns snt snu soa sob son soo sor sos sot sou sr- sra srb srn sro srr srs srt ss- ssa ssb ssn sso ssr sss sst ssu sta stb stn sto str sts stt stu sua sub sun suo sur sus sut suu taa tab tan tao tar tas tat tau tba tbb tbn tbo tbr tbs tbt tbu tna tnb tnn tno tnr tns tnt to- toa tob ton too tor tos tot tou tra trb trn tro trr trs trt tru tsa tsb tsn tso tsr tss tst tsu tta ttb ttn tto ttr tts ttt ttu tua tub tun tuo tur tus tut tuu ua- uaa uab uan uao uar uas uat uau uba ubb ubn ubo ubr ubs ubt ubu un- una unb unn uno unr uns unt unu uoa uob uon uoo uor uos uot ur- ura urb urn uro urr urs urt uru usa usb usn uso usr uss ust usu uta utb utn uto utr uts utt utu uua uun uur uus uut uuu