b-u bbb bbm bbn bbo bbs bbt bbu bmb bmm bmn bmo bms bmt bmu bnb bnn bno bns bnt bnu bob bom bon boo bos bot bou bsb bsm bsn bso bss bst bsu btb btm btn bto bts btt btu bub bum bun buo bus but buu m-o mbb mbm mbo mbs mbt mbu mmb mmm mmn mmo mms mmt mmu mnb mnm mnn mno mns mnt mnu mob mom mon moo mos mot mou msb msm msn mso mss mst msu mtb mtm mtn mto mts mtt mtu mub mum mun mus mut muu nbb nbm nbn nbo nbs nbt nbu nmb nmm nmn nmo nms nmt nmu nnb nnm nnn nno nns nnt nnu no- nob nom non noo nos not nou nsb nsm nsn nso nss nst nsu ntb ntm ntn nto nts ntt ntu nub num nun nuo nus nut nuu ob- obb obm obn obo obs obt obu om- omb omm omn omo oms omt omu on- onb onn ono ons ont onu oo- oob oom oon ooo oos oot os- osb osm osn oso oss ost osu ot- otb otm otn oto ots ott otu ou- oum oun ouo ous out sbb sbm sbn sbo sbs sbt sbu smb smm smn smo sms smt smu snb snm snn sno sns snt snu sob som son soo sos sot sou ss- ssb ssm ssn sso sss sst ssu stb stm stn sto sts stt stu sub sum sun suo sus sut suu tbb tbm tbn tbo tbs tbt tbu tmb tmm tmn tmo tms tmt tmu tnb tnm tnn tno tns tnt to- tob tom ton too tos tot tou tsb tsm tsn tso tss tst tsu ttb ttm ttn tto tts ttt ttu tub tum tun tuo tus tut tuu ubb ubn ubo ubs ubt ubu um- umb umm umn umo ums umt umu un- unb unm unn uno uns unt unu uob uom uon uoo uos uot usb usm usn uso uss ust usu utb utm utn uto uts utt utu uum uun uus uut uuu