-er bbb bbe bbi bbl bbr bbs be- beb bee bei bel ber bes bi- bib bie bii bil bir bis blb ble bli bll blr bls brb bre bri brl brr brs bsb bse bsi bsl bsr bss ebb ebe ebi ebl ebr ebs eeb eee eel eer ees eib eie eii eil eir eis elb ele eli ell elr els erb ere eri erl err ers es- esb ese esi esl esr ess ibb ibe ibi ibl ibr ibs ie- iee iei iel ier ies iib iie iii iil iir iis il- ilb ile ili ill ilr ils ir- irb ire iri irl irr irs is- isb ise isi isl isr iss lbb lbe lbi lbl lbr lbs leb lee lei lel ler les lib lie lii lil lir lis llb lle lli lll llr lls lrb lri lrr lrs lsb lse lsi lsl lsr lss rbb rbe rbi rbl rbr rbs re- reb ree rei rel rer res rib rie rii ril rir ris rle rli rll rlr rls rrb rri rrl rrr rrs rsb rse rsi rsl rsr rss sbb sbe sbi sbl sbr sbs se- seb see sei sel ser ses sib sie sii sil sir sis slb sle sli sll slr sls sr- srb sre sri srl srr srs ss- ssb sse ssi ssl ssr sss