b-u bbb bbc bbd bbe bbo bbu bcb bcc bcd bce bco bcu bdb bdc bdd bde bdo bdu be- beb bec bed bee beo beu bob boc bod boe boo bou bub buc bud bue buo buu c-- cbb cbc cbd cbe cbo cbu ccb ccc ccd cce cco ccu cdb cdc cdd cde cdo cdu ce- ceb cec ced cee ceo ceu co- cob coc cod coe coo cou cub cuc cud cue cuo cuu dbb dbc dbd dbe dbo dbu dcb dcc dcd dce dco dcu ddb ddc ddd dde ddo ddu de- deb dec ded dee deo deu dob doc dod doe doo dou dub duc dud due duo ebb ebc ebd ebe ebo ebu ec- ecb ecc ecd ece eco ecu ed- edb edc edd ede edo edu eeb eec eed eee eeo eo- eob eoc eod eoe eoo eou eu- eub euc eud eue ob- obb obc obd obe obo obu oc- ocb occ ocd oco ocu odb odc odd ode odo odu oeb oec oed oee oeo oo- oob ooc ood ooo ou- ouc oud oue ouo ubb ubc ube ubo ubu ucb ucc ucd uce uco ucu udb udc udd ude udo udu ueb uec ued uee uob uoc uod uoe uoo uuc uue uuu