b-u bbb bbd bbe bbo bbu bdb bdd bde bdo bdu be- beb bed bee beo beu bob bod boe boo bou bub bud bue buo buu dbb dbd dbe dbo dbu ddb ddd dde ddo ddu de- deb ded dee deo deu dob dod doe doo dou dub dud due duo ebb ebd ebe ebo ebu ed- edb edd ede edo edu eeb eed eee eeo eo- eob eod eoe eoo eou eu- eub eud eue ob- obb obd obe obo obu odb odd ode odo odu oeb oed oee oeo oo- oob ood ooo ou- oud oue ouo ubb ube ubo ubu udb udd ude udo udu ueb ued uee uob uod uoe uoo uue uuu