b-u bbb bbc bbd bbn bbo bbs bbt bbu bcb bcc bcd bcn bco bcs bct bcu bdb bdc bdd bdo bds bdt bdu bnb bnc bnd bnn bno bns bnt bnu bob boc bod bon boo bos bot bou bsb bsc bsd bsn bso bss bst bsu btb btc btd btn bto bts btt btu bub buc bud bun buo bus but buu c-- cbb cbc cbd cbn cbo cbs cbt cbu ccb ccc ccd ccn cco ccs cct ccu cdb cdc cdd cdn cdo cds cdt cdu cn- cnb cnc cnd cnn cno cns cnt cnu co- cob coc cod con coo cos cot cou csb csc csd csn cso css cst csu ctb ctc ctd ctn cto cts ctt ctu cub cuc cud cun cuo cus cut cuu dbb dbc dbd dbn dbo dbs dbt dbu dcb dcc dcd dcn dco dcs dct dcu ddb ddc ddd ddn ddo dds ddt ddu dnb dnc dnd dnn dno dns dnt dob doc dod don doo dos dot dou dsb dsc dsd dsn dso dss dst dsu dtb dtc dtd dtn dto dts dtt dtu dub duc dud dun duo dus dut nbb nbc nbd nbn nbo nbs nbt nbu ncb ncc ncd ncn nco ncs nct ncu ndb ndc ndd ndn ndo nds ndt ndu nnb nnc nnn nno nns nnt nnu no- nob noc nod non noo nos not nou nsb nsc nsd nsn nso nss nst nsu ntb ntc ntd ntn nto nts ntt ntu nub nuc nud nun nuo nus nut nuu ob- obb obc obd obn obo obs obt obu oc- ocb occ ocd ocn oco ocs oct ocu odb odc odd odn odo ods odt odu on- onb onc ond onn ono ons ont onu oo- oob ooc ood oon ooo oos oot os- osb osc osd osn oso oss ost osu ot- otb otc otd otn oto ots ott otu ou- ouc oud oun ouo ous out sbb sbc sbd sbn sbo sbs sbt sbu scb scc scd scn sco scs sct scu sdb sdc sdd sdn sdo sds sdt sdu snb snc snd snn sno sns snt snu sob soc sod son soo sos sot sou ss- ssb ssc ssd ssn sso sss sst ssu stb stc std stn sto sts stt stu sub suc sud sun suo sus sut suu tbb tbc tbd tbn tbo tbs tbt tbu tcb tcc tcd tcn tco tcs tct tcu tdb tdc tdd tdn tdo tds tdt tdu tnb tnc tnd tnn tno tns tnt to- tob toc tod ton too tos tot tou tsb tsc tsd tsn tso tss tst tsu ttb ttc ttd ttn tto tts ttt ttu tub tuc tud tun tuo tus tut tuu ubb ubc ubn ubo ubs ubt ubu ucb ucc ucd ucn uco ucs uct ucu udb udc udd udn udo uds udt udu un- unb unc und unn uno uns unt unu uob uoc uod uon uoo uos uot usb usc usd usn uso uss ust usu utb utc utd utn uto uts utt utu uuc uun uus uut uuu