-er bbb bbe bbl bbn bbr bbs be- beb bee bel ben ber bes blb ble bll bln blr bls bnb bne bnl bnn bnr bns brb bre brl brn brr brs bsb bse bsl bsn bsr bss ebb ebe ebl ebn ebr ebs eeb eee eel een eer ees elb ele ell eln elr els en- enb ene enl enn enr ens erb ere erl ern err ers es- esb ese esl esn esr ess lbb lbe lbl lbr lbs leb lee lel len ler les llb lle lll lln llr lls lnb lne lnl lnn lnr lns lrb lrn lrr lrs lsb lse lsl lsn lsr lss nbb nbe nbl nbn nbr nbs ne- neb nee nel nen ner nes nlb nle nll nln nlr nls nnb nne nnl nnn nns nrb nre nrl nrn nrr nrs nsb nse nsl nsn nsr nss rbb rbe rbl rbn rbr rbs re- reb ree rel ren rer res rle rll rln rlr rls rnb rnn rnr rns rrb rrl rrn rrr rrs rsb rse rsl rsn rsr rss sbb sbe sbl sbn sbr sbs se- seb see sel sen ser ses slb sle sll sln slr sls snb sne snl snn snr sns sr- srb sre srl srn srr srs ss- ssb sse ssl ssn ssr sss