bbb bbm bbn bbr bbs bbt bmb bmm bmn bmr bms bmt bnb bnn bnr bns bnt brb brm brn brr brs brt bsb bsm bsn bsr bss bst btb btm btn btr bts btt m-r mbb mbm mbr mbs mbt mmb mmm mmn mmr mms mmt mnb mnm mnn mnr mns mnt mrb mrm mrn mrr mrs mrt msb msm msn msr mss mst mtb mtm mtn mtr mts mtt nbb nbm nbn nbr nbs nbt nmb nmm nmn nmr nms nmt nnb nnm nnn nns nnt nrb nrm nrn nrr nrs nrt nsb nsm nsn nsr nss nst ntb ntm ntn ntr nts ntt rbb rbm rbn rbr rbs rbt rmb rmm rmn rmr rms rmt rnb rnm rnn rnr rns rnt rrb rrm rrn rrr rrs rrt rsb rsm rsn rsr rss rst rtb rtm rtn rtr rts rtt sbb sbm sbn sbr sbs sbt smb smm smn smr sms smt snb snm snn snr sns snt sr- srb srm srn srr srs srt ss- ssb ssm ssn ssr sss sst stb stm stn str sts stt tbb tbm tbn tbr tbs tbt tmb tmm tmn tmr tms tmt tnb tnm tnn tnr tns tnt trb trm trn trr trs trt tsb tsm tsn tsr tss tst ttb ttm ttn ttr tts ttt