b-u bbb bbd bbe bbk bbl bbs bbu bdb bdd bde bdk bdl bds bdu be- beb bed bee bek bel bes beu bkb bke bkk bkl bks blb bld ble blk bll bls blu bsb bsd bse bsk bsl bss bsu bub bud bue buk bul bus buu dbb dbd dbe dbk dbl dbs dbu ddb ddd dde ddk ddl dds ddu de- deb ded dee dek del des deu dkb dke dkk dkl dks dku dl- dlb dld dle dlk dll dls dlu dsb dsd dse dsk dsl dss dsu dub dud due duk dul dus ebb ebd ebe ebk ebl ebs ebu ed- edb edd ede edk edl eds edu eeb eed eee eek eel ees ekb ekd eke ekl eks eku elb eld ele elk ell els elu es- esb esd ese esk esl ess esu eu- eub eud eue eul eus kbb kbd kbe kbk kbl kbs kbu kdb kde kdk kdl kds kdu ke- keb ked kee kek kel kes kkb kke kkk kkl kks kku kl- klb kld kls klu ksb ksd kse ksk ksl kss ksu kub kud kue kuk kul kus kuu lbb lbd lbe lbk lbl lbs lbu ldb ldd lde ldk ldl lds ldu leb led lee lek lel les leu lkb lkl lks llb lld lle llk lll lls llu lsb lsd lse lsk lsl lss lsu lub lud lue luk lul lus luu sbb sbd sbe sbk sbl sbs sbu sdb sdd sde sdk sdl sds sdu se- seb sed see sek sel ses seu sk- skb skd ske skk skl sks sku slb sld sle slk sll sls slu ss- ssb ssd sse ssk ssl sss ssu sub sud sue suk sul sus suu ubb ube ubk ubl ubs ubu udb udd ude udk udl uds udu ueb ued uee uel ues ukb uke ukk ukl uku ulb uld ule ulk ull uls ulu usb usd use usk usl uss usu uue uus uuu