bbb bbe bbl bbn bbs be- beb bee bel ben bes blb ble bll bln bls bnb bne bnl bnn bns bsb bse bsl bsn bss ebb ebe ebl ebn ebs eeb eee eel een ees elb ele ell eln els en- enb ene enl enn ens es- esb ese esl esn ess lbb lbe lbl lbs leb lee lel len les llb lle lll lln lls lnb lne lnl lnn lns lsb lse lsl lsn lss nbb nbe nbl nbn nbs ne- neb nee nel nen nes nlb nle nll nln nls nnb nne nnl nnn nns nsb nse nsl nsn nss sbb sbe sbl sbn sbs se- seb see sel sen ses slb sle sll sln sls snb sne snl snn sns ss- ssb sse ssl ssn sss