-er bbb bbe bbn bbr bbs bbt be- beb bee ben ber bes bet bnb bne bnn bnr bns bnt brb bre brn brr brs brt bsb bse bsn bsr bss bst btb bte btn btr bts btt ebb ebe ebn ebr ebs ebt eeb eee een eer ees eet en- enb ene enn enr ens ent erb ere ern err ers ert es- esb ese esn esr ess est etb ete etn etr ets ett nbb nbe nbn nbr nbs nbt ne- neb nee nen ner nes net nnb nne nnn nns nnt nrb nre nrn nrr nrs nrt nsb nse nsn nsr nss nst ntb nte ntn ntr nts ntt rbb rbe rbn rbr rbs rbt re- reb ree ren rer res ret rnb rnn rnr rns rnt rrb rrn rrr rrs rrt rsb rse rsn rsr rss rst rtb rte rtn rtr rts rtt sbb sbe sbn sbr sbs sbt se- seb see sen ser ses set snb sne snn snr sns snt sr- srb sre srn srr srs srt ss- ssb sse ssn ssr sss sst stb ste stn str sts stt tbb tbe tbn tbr tbs tbt te- teb tee ten ter tes tet tnb tne tnn tnr tns tnt trb tre trn trr trs trt tsb tse tsn tsr tss tst ttb tte ttn ttr tts ttt