b-u bbb bbc bbd bbe bbo bbt bbu bcb bcc bcd bce bco bct bcu bdb bdc bdd bde bdo bdt bdu be- beb bec bed bee beo bet beu bob boc bod boe boo bot bou btb btc btd bte bto btt btu bub buc bud bue buo but buu c-- cbb cbc cbd cbe cbo cbt cbu ccb ccc ccd cce cco cct ccu cdb cdc cdd cde cdo cdt cdu ce- ceb cec ced cee ceo cet ceu co- cob coc cod coe coo cot cou ctb ctc ctd cte cto ctt ctu cub cuc cud cue cuo cut cuu dbb dbc dbd dbe dbo dbt dbu dcb dcc dcd dce dco dct dcu ddb ddc ddd dde ddo ddt ddu de- deb dec ded dee deo det deu dob doc dod doe doo dot dou dtb dtc dtd dte dto dtt dtu dub duc dud due duo dut ebb ebc ebd ebe ebo ebt ebu ec- ecb ecc ecd ece eco ect ecu ed- edb edc edd ede edo edt edu eeb eec eed eee eeo eet eo- eob eoc eod eoe eoo eot eou etb etc etd ete eto ett etu eu- eub euc eud eue eut ob- obb obc obd obe obo obt obu oc- ocb occ ocd oco oct ocu odb odc odd ode odo odt odu oeb oec oed oee oeo oet oo- oob ooc ood ooo oot ot- otb otc otd ote oto ott otu ou- ouc oud oue ouo out tbb tbc tbd tbe tbo tbt tbu tcb tcc tcd tce tco tct tcu tdb tdc tdd tde tdo tdt tdu te- teb tec ted tee teo tet teu to- tob toc tod toe too tot tou ttb ttc ttd tte tto ttt ttu tub tuc tud tue tuo tut tuu ubb ubc ube ubo ubt ubu ucb ucc ucd uce uco uct ucu udb udc udd ude udo udt udu ueb uec ued uee uet uob uoc uod uoe uoo uot utb utc utd ute uto utt utu uuc uue uut uuu