b-u bbb bbf bbn bbo bbs bbu bbx bfb bff bfn bfo bfs bfu bfx bnb bnf bnn bno bns bnu bnx bob bof bon boo bos bou box bsb bsf bsn bso bss bsu bsx bub buf bun buo bus buu bux bxb bxn bxo bxx fbb fbf fbn fbo fbs fbu fbx fff ffn ffo ffs ffu ffx fnb fnf fnn fns fnu fnx fob fof fon foo fos fou fox fsb fsf fsn fso fss fsu fsx fub fuf fun fuo fus fuu fux fxs fxu fxx nbb nbf nbn nbo nbs nbu nbx nfb nff nfn nfo nfs nfu nnb nnf nnn nno nns nnu no- nob nof non noo nos nou nox nsb nsf nsn nso nss nsu nsx nub nun nuo nus nuu nux ob- obb obf obn obo obs obu obx of- ofb off ofn ofo ofs ofu ofx on- onb onf onn ono ons onu onx oo- oob oof oon ooo oos oox os- osb osf osn oso oss osu osx ou- ouf oun ouo ous ox- oxb oxf oxn oxo oxx sbb sbf sbn sbo sbs sbu sbx sfb sff sfn sfo sfs sfu sfx snb snf snn sno sns snu sob sof son soo sos sou sox ss- ssb ssf ssn sso sss ssu ssx sub suf sun suo sus suu sux sxn sxs sxu ubb ubf ubn ubo ubs ubu ubx uff ufn ufo ufs ufu ufx un- unb unf unn uno uns unu unx uob uon uoo uos uox usb usf usn uso uss usu usx uun uus uuu uxb uxf uxo uxu xbx xfn xfs xfx xno xns xnu xof xon xoo xos xox xsb xss xun xus xxo xxx