b-u bbb bbd bbf bbn bbo bbu bbx bdb bdd bdf bdo bdu bdx bfb bfd bff bfn bfo bfu bfx bnb bnd bnf bnn bno bnu bnx bob bod bof bon boo bou box bub bud buf bun buo buu bux bxb bxd bxn bxo bxx dbb dbd dbf dbn dbo dbu dbx ddb ddd ddf ddn ddo ddu ddx dfb dfd dff dfn dfo dfu dfx dnb dnd dnf dnn dno dob dod dof don doo dou dox dub dud duf dun duo dux dxd dxn dxo dxx fbb fbd fbf fbn fbo fbu fbx fdb fdd fdf fdn fdo fdu fdx ffd fff ffn ffo ffu ffx fnb fnd fnf fnn fnu fnx fob fof fon foo fou fox fub fud fuf fun fuo fuu fux fxu fxx nbb nbd nbf nbn nbo nbu nbx ndb ndd ndf ndn ndo ndu nfb nfd nff nfn nfo nfu nnb nnf nnn nno nnu no- nob nod nof non noo nou nox nub nud nun nuo nuu nux nxd ob- obb obd obf obn obo obu obx odb odd odf odn odo odu of- ofb ofd off ofn ofo ofu ofx on- onb ond onf onn ono onu onx oo- oob ood oof oon ooo oox ou- oud ouf oun ouo ox- oxb oxf oxn oxo oxx ubb ubf ubn ubo ubu ubx udb udd udf udn udo udu udx ufd uff ufn ufo ufu ufx un- unb und unf unn uno unu unx uob uod uon uoo uox uun uuu uxb uxf uxo uxu xbx xdb xdf xfn xfx xno xnu xod xof xon xoo xox xun xxo xxx