bbb bbi bbm bbr bbs bbt bi- bib bii bim bir bis bit bmb bmi bmm bmr bms bmt brb bri brm brr brs brt bsb bsi bsm bsr bss bst btb bti btm btr bts btt ibb ibi ibm ibr ibs ibt iib iii iim iir iis iit im- imb imi imm ims imt ir- irb iri irm irr irs irt is- isb isi ism isr iss ist itb iti itm its itt m-r mbb mbi mbm mbr mbs mbt mi- mib mii mim mir mis mit mmb mmi mmm mmr mms mmt mrb mri mrm mrr mrs mrt msb msi msm msr mss mst mtb mti mtm mtr mts mtt rbb rbi rbm rbr rbs rbt rib rii rim rir ris rit rmb rmi rmm rmr rms rmt rrb rri rrm rrr rrs rrt rsb rsi rsm rsr rss rst rtb rti rtm rtr rts rtt sbb sbi sbm sbr sbs sbt sib sii sim sir sis sit smb smi smm smr sms smt sr- srb sri srm srr srs srt ss- ssb ssi ssm ssr sss sst stb sti stm str sts stt tbb tbi tbm tbr tbs tbt tib tii tim tir tis tit tmb tmi tmm tmr tms tmt trb tri trm trr trs trt tsb tsi tsm tsr tss tst ttb tti ttm ttr tts ttt