bbb bbe bbk bbl bbs bbt be- beb bee bek bel bes bet bkb bke bkk bkl bks bkt blb ble blk bll bls blt bsb bse bsk bsl bss bst btb bte btk btl bts btt ebb ebe ebk ebl ebs ebt eeb eee eek eel ees eet ekb eke ekl eks ekt elb ele elk ell els elt es- esb ese esk esl ess est etb ete etk etl ets ett k-t kbb kbe kbk kbl kbs ke- keb kee kek kel kes ket kkb kke kkk kkl kks kkt kl- klb kls klt ksb kse ksk ksl kss kst ktb kte ktk ktl kts ktt lbb lbe lbk lbl lbs lbt leb lee lek lel les let lkb lkl lks lkt llb lle llk lll lls llt lsb lse lsk lsl lss lst ltb lte ltk ltl lts ltt sbb sbe sbk sbl sbs sbt se- seb see sek sel ses set sk- skb ske skk skl sks skt slb sle slk sll sls slt ss- ssb sse ssk ssl sss sst stb ste stk stl sts stt tbb tbe tbk tbl tbs tbt te- teb tee tek tel tes tet tkb tke tkk tkl tks tkt tle tlk tll tls tlt tsb tse tsk tsl tss tst ttb tte ttk ttl tts ttt