a-a a-b a-t aaa aab aad aan aao aas aat aau ab- aba abb abd abn abo abs abt abu ad- ada adb add adn ado ads adt adu an- ana anb and ann ano ans ant anu aoa aob aod aon aoo aos aot aou as- asa asb asd asn aso ass ast asu at- ata atb atd atn ato ats att atu au- aua aub aud aun auo aus aut b-u baa bab bad ban bao bas bat bau bba bbb bbd bbn bbo bbs bbt bbu bda bdb bdd bdo bds bdt bdu bna bnb bnd bnn bno bns bnt bnu boa bob bod bon boo bos bot bou bsa bsb bsd bsn bso bss bst bsu bta btb btd btn bto bts btt btu bua bub bud bun buo bus but buu daa dab dad dan dao das dat dau dba dbb dbd dbn dbo dbs dbt dbu dda ddb ddd ddn ddo dds ddt ddu dna dnb dnd dnn dno dns dnt doa dob dod don doo dos dot dou dsa dsb dsd dsn dso dss dst dsu dta dtb dtd dtn dto dts dtt dtu dua dub dud dun duo dus dut naa nab nad nan nao nas nat nau nba nbb nbd nbn nbo nbs nbt nbu nda ndb ndd ndn ndo nds ndt ndu nna nnb nnn nno nns nnt nnu no- noa nob nod non noo nos not nou nsa nsb nsd nsn nso nss nst nsu nta ntb ntd ntn nto nts ntt ntu nua nub nud nun nuo nus nut nuu oaa oab oad oan oao oas oat oau ob- oba obb obd obn obo obs obt obu oda odb odd odn odo ods odt odu on- ona onb ond onn ono ons ont onu oo- ooa oob ood oon ooo oos oot os- osa osb osd osn oso oss ost osu ot- ota otb otd otn oto ots ott otu ou- oua oud oun ouo ous out saa sab sad san sao sas sat sau sba sbb sbd sbn sbo sbs sbt sbu sda sdb sdd sdn sdo sds sdt sdu sna snb snd snn sno sns snt snu soa sob sod son soo sos sot sou ss- ssa ssb ssd ssn sso sss sst ssu sta stb std stn sto sts stt stu sua sub sud sun suo sus sut suu taa tab tad tan tao tas tat tau tba tbb tbd tbn tbo tbs tbt tbu tda tdb tdd tdn tdo tds tdt tdu tna tnb tnd tnn tno tns tnt to- toa tob tod ton too tos tot tou tsa tsb tsd tsn tso tss tst tsu tta ttb ttd ttn tto tts ttt ttu tua tub tud tun tuo tus tut tuu ua- uaa uab uad uan uao uas uat uau uba ubb ubn ubo ubs ubt ubu uda udb udd udn udo uds udt udu un- una unb und unn uno uns unt unu uoa uob uod uon uoo uos uot usa usb usd usn uso uss ust usu uta utb utd utn uto uts utt utu uua uun uus uut uuu