b-u bbb bbi bbl bbm bbr bbs bbt bbu bi- bib bii bil bim bir bis bit biu blb bli bll blm blr bls blt blu bmb bmi bml bmm bmr bms bmt bmu brb bri brl brm brr brs brt bru bsb bsi bsl bsm bsr bss bst bsu btb bti btl btm btr bts btt btu bub bui bul bum bur bus but buu ibb ibi ibl ibm ibr ibs ibt ibu iib iii iil iim iir iis iit iiu il- ilb ili ill ilm ilr ils ilt ilu im- imb imi iml imm ims imt imu ir- irb iri irl irm irr irs irt iru is- isb isi isl ism isr iss ist isu itb iti itl itm its itt itu iu- iub iui ium iur ius iut lbb lbi lbl lbm lbr lbs lbt lbu lib lii lil lim lir lis lit liu llb lli lll llm llr lls llt llu lmb lmi lml lmm lmr lms lmt lmu lrb lri lrm lrr lrs lrt lru lsb lsi lsl lsm lsr lss lst lsu ltb lti ltl ltm ltr lts ltt ltu lub lui lul lum lur lus lut luu m-r mbb mbi mbl mbm mbr mbs mbt mbu mi- mib mii mil mim mir mis mit miu mlb mli mll mlm mlr mls mlt mlu mmb mmi mml mmm mmr mms mmt mmu mrb mri mrl mrm mrr mrs mrt mru msb msi msl msm msr mss mst msu mtb mti mtl mtm mtr mts mtt mtu mub mui mul mum mur mus mut muu rbb rbi rbl rbm rbr rbs rbt rbu rib rii ril rim rir ris rit rli rll rlm rlr rls rlt rlu rmb rmi rml rmm rmr rms rmt rrb rri rrl rrm rrr rrs rrt rru rsb rsi rsl rsm rsr rss rst rsu rtb rti rtl rtm rtr rts rtt rtu rub rui rum rur rus rut ruu sbb sbi sbl sbm sbr sbs sbt sbu sib sii sil sim sir sis sit siu slb sli sll slm slr sls slt slu smb smi sml smm smr sms smt smu sr- srb sri srl srm srr srs srt ss- ssb ssi ssl ssm ssr sss sst ssu stb sti stl stm str sts stt stu sub sui sul sum sur sus sut suu tbb tbi tbl tbm tbr tbs tbt tbu tib tii til tim tir tis tit tiu tli tll tlm tlr tls tlt tlu tmb tmi tml tmm tmr tms tmt tmu trb tri trl trm trr trs trt tru tsb tsi tsl tsm tsr tss tst tsu ttb tti ttl ttm ttr tts ttt ttu tub tui tul tum tur tus tut tuu ubb ubi ubl ubr ubs ubt ubu uib uii uil uim uir uis uit uiu ulb uli ull ulm ulr uls ult ulu um- umb umi uml umm umr ums umt umu ur- urb uri url urm urr urs urt uru usb usi usl usm usr uss ust usu utb uti utl utm utr uts utt utu uum uur uus uut uuu