b-u bbb bbm bbn bbs bbu bmb bmm bmn bms bmu bnb bnn bns bnu bsb bsm bsn bss bsu bub bum bun bus buu mbb mbm mbs mbu mmb mmm mmn mms mmu mnb mnm mnn mns mnu msb msm msn mss msu mub mum mun mus muu nbb nbm nbn nbs nbu nmb nmm nmn nms nmu nnb nnm nnn nns nnu nsb nsm nsn nss nsu nub num nun nus nuu sbb sbm sbn sbs sbu smb smm smn sms smu snb snm snn sns snu ss- ssb ssm ssn sss ssu sub sum sun sus suu ubb ubn ubs ubu um- umb umm umn ums umu un- unb unm unn uns unu usb usm usn uss usu uum uun uus uuu