a-a a-b aaa aab aam aan aas aau ab- aba abb abm abn abs abu ama amb amm amn ams amu an- ana anb anm ann ans anu as- asa asb asm asn ass asu au- aua aub aum aun aus b-u baa bab bam ban bas bau bba bbb bbm bbn bbs bbu bma bmb bmm bmn bms bmu bna bnb bnn bns bnu bsa bsb bsm bsn bss bsu bua bub bum bun bus buu maa mab mam man mas mau mba mbb mbm mbs mbu mma mmb mmm mmn mms mmu mna mnb mnm mnn mns mnu msa msb msm msn mss msu mua mub mum mun mus muu naa nab nam nan nas nau nba nbb nbm nbn nbs nbu nma nmb nmm nmn nms nmu nna nnb nnm nnn nns nnu nsa nsb nsm nsn nss nsu nua nub num nun nus nuu saa sab sam san sas sau sba sbb sbm sbn sbs sbu sma smb smm smn sms smu sna snb snm snn sns snu ss- ssa ssb ssm ssn sss ssu sua sub sum sun sus suu ua- uaa uab uam uan uas uau uba ubb ubn ubs ubu um- uma umb umm umn ums umu un- una unb unm unn uns unu usa usb usm usn uss usu uua uum uun uus uuu