a-a a-b aaa aab aam aan aao aas aau ab- aba abb abm abn abo abs abu ama amb amm amn amo ams amu an- ana anb anm ann ano ans anu aoa aob aom aon aoo aos aou as- asa asb asm asn aso ass asu au- aua aub aum aun auo aus b-u baa bab bam ban bao bas bau bba bbb bbm bbn bbo bbs bbu bma bmb bmm bmn bmo bms bmu bna bnb bnn bno bns bnu boa bob bom bon boo bos bou bsa bsb bsm bsn bso bss bsu bua bub bum bun buo bus buu m-o maa mab mam man mao mas mau mba mbb mbm mbo mbs mbu mma mmb mmm mmn mmo mms mmu mna mnb mnm mnn mno mns mnu moa mob mom mon moo mos mou msa msb msm msn mso mss msu mua mub mum mun mus muu naa nab nam nan nao nas nau nba nbb nbm nbn nbo nbs nbu nma nmb nmm nmn nmo nms nmu nna nnb nnm nnn nno nns nnu no- noa nob nom non noo nos nou nsa nsb nsm nsn nso nss nsu nua nub num nun nuo nus nuu oaa oab oam oan oao oas oau ob- oba obb obm obn obo obs obu om- oma omb omm omn omo oms omu on- ona onb onn ono ons onu oo- ooa oob oom oon ooo oos os- osa osb osm osn oso oss osu ou- oua oum oun ouo ous saa sab sam san sao sas sau sba sbb sbm sbn sbo sbs sbu sma smb smm smn smo sms smu sna snb snm snn sno sns snu soa sob som son soo sos sou ss- ssa ssb ssm ssn sso sss ssu sua sub sum sun suo sus suu ua- uaa uab uam uan uao uas uau uba ubb ubn ubo ubs ubu um- uma umb umm umn umo ums umu un- una unb unm unn uno uns unu uoa uob uom uon uoo uos usa usb usm usn uso uss usu uua uum uun uus uuu