bbb bbm bbn bbo bbs bbt bmb bmm bmn bmo bms bmt bnb bnn bno bns bnt bob bom bon boo bos bot bsb bsm bsn bso bss bst btb btm btn bto bts btt m-o mbb mbm mbo mbs mbt mmb mmm mmn mmo mms mmt mnb mnm mnn mno mns mnt mob mom mon moo mos mot msb msm msn mso mss mst mtb mtm mtn mto mts mtt nbb nbm nbn nbo nbs nbt nmb nmm nmn nmo nms nmt nnb nnm nnn nno nns nnt no- nob nom non noo nos not nsb nsm nsn nso nss nst ntb ntm ntn nto nts ntt ob- obb obm obn obo obs obt om- omb omm omn omo oms omt on- onb onn ono ons ont oo- oob oom oon ooo oos oot os- osb osm osn oso oss ost ot- otb otm otn oto ots ott sbb sbm sbn sbo sbs sbt smb smm smn smo sms smt snb snm snn sno sns snt sob som son soo sos sot ss- ssb ssm ssn sso sss sst stb stm stn sto sts stt tbb tbm tbn tbo tbs tbt tmb tmm tmn tmo tms tmt tnb tnm tnn tno tns tnt to- tob tom ton too tos tot tsb tsm tsn tso tss tst ttb ttm ttn tto tts ttt