b-u bbb bbd bbi bbl bbr bbs bbu bdb bdd bdi bdl bdr bds bdu bi- bib bid bii bil bir bis biu blb bld bli bll blr bls blu brb brd bri brl brr brs bru bsb bsd bsi bsl bsr bss bsu bub bud bui bul bur bus buu dbb dbd dbi dbl dbr dbs dbu ddb ddd ddi ddl ddr dds ddu di- dib did dii dil dir dis diu dl- dlb dld dli dll dlr dls dlu drb drd dri drl drr drs dru dsb dsd dsi dsl dsr dss dsu dub dud dui dul dur dus i-d ibb ibd ibi ibl ibr ibs ibu idb idd idi idl idr ids idu iib iid iii iil iir iis iiu il- ilb ild ili ill ilr ils ilu ir- irb ird iri irl irr irs iru is- isb isd isi isl isr iss isu iu- iub iud iui iur ius lbb lbd lbi lbl lbr lbs lbu ldb ldd ldi ldl ldr lds ldu lib lid lii lil lir lis liu llb lld lli lll llr lls llu lrb lrd lri lrr lrs lru lsb lsd lsi lsl lsr lss lsu lub lud lui lul lur lus luu rbb rbd rbi rbl rbr rbs rbu rdb rdd rdi rdl rdr rds rdu rib rid rii ril rir ris rld rli rll rlr rls rlu rrb rrd rri rrl rrr rrs rru rsb rsd rsi rsl rsr rss rsu rub rud rui rur rus ruu sbb sbd sbi sbl sbr sbs sbu sdb sdd sdi sdl sdr sds sdu sib sid sii sil sir sis siu slb sld sli sll slr sls slu sr- srb srd sri srl srr srs ss- ssb ssd ssi ssl ssr sss ssu sub sud sui sul sur sus suu ubb ubi ubl ubr ubs ubu udb udd udi udl udr uds udu uib uid uii uil uir uis uiu ulb uld uli ull ulr uls ulu ur- urb urd uri url urr urs uru usb usd usi usl usr uss usu uur uus uuu