b-u bbb bbd bbn bbs bbu bdb bdd bds bdu bnb bnd bnn bns bnu bsb bsd bsn bss bsu bub bud bun bus buu dbb dbd dbn dbs dbu ddb ddd ddn dds ddu dnb dnd dnn dns dsb dsd dsn dss dsu dub dud dun dus nbb nbd nbn nbs nbu ndb ndd ndn nds ndu nnb nnn nns nnu nsb nsd nsn nss nsu nub nud nun nus nuu sbb sbd sbn sbs sbu sdb sdd sdn sds sdu snb snd snn sns snu ss- ssb ssd ssn sss ssu sub sud sun sus suu ubb ubn ubs ubu udb udd udn uds udu un- unb und unn uns unu usb usd usn uss usu uun uus uuu