bbb bbi bbk bbl bbs bi- bib bii bik bil bis bkb bkk bkl bks blb bli blk bll bls bsb bsi bsk bsl bss ibb ibi ibk ibl ibs iib iii iil iis ikb iki ikk ikl iks il- ilb ili ilk ill ils is- isb isi isk isl iss kbb kbi kbk kbl kbs kib kii kik kil kis kkb kki kkk kkl kks kl- klb kli kls ksb ksi ksk ksl kss lbb lbi lbk lbl lbs lib lii lik lil lis lkb lkl lks llb lli llk lll lls lsb lsi lsk lsl lss sbb sbi sbk sbl sbs sib sii sik sil sis sk- skb ski skk skl sks slb sli slk sll sls ss- ssb ssi ssk ssl sss