-er b-u bbb bbe bbn bbr bbs bbt bbu be- beb bee ben ber bes bet beu bnb bne bnn bnr bns bnt bnu brb bre brn brr brs brt bru bsb bse bsn bsr bss bst bsu btb bte btn btr bts btt btu bub bue bun bur bus but buu ebb ebe ebn ebr ebs ebt ebu eeb eee een eer ees eet en- enb ene enn enr ens ent enu erb ere ern err ers ert eru es- esb ese esn esr ess est esu etb ete etn etr ets ett etu eu- eub eue eun eur eus eut nbb nbe nbn nbr nbs nbt nbu ne- neb nee nen ner nes net neu nnb nne nnn nns nnt nnu nrb nre nrn nrr nrs nrt nru nsb nse nsn nsr nss nst nsu ntb nte ntn ntr nts ntt ntu nub nue nun nur nus nut nuu rbb rbe rbn rbr rbs rbt rbu re- reb ree ren rer res ret reu rnb rnn rnr rns rnt rnu rrb rrn rrr rrs rrt rru rsb rse rsn rsr rss rst rsu rtb rte rtn rtr rts rtt rtu rub rue run rur rus rut ruu sbb sbe sbn sbr sbs sbt sbu se- seb see sen ser ses set seu snb sne snn snr sns snt snu sr- srb sre srn srr srs srt ss- ssb sse ssn ssr sss sst ssu stb ste stn str sts stt stu sub sue sun sur sus sut suu tbb tbe tbn tbr tbs tbt tbu te- teb tee ten ter tes tet teu tnb tne tnn tnr tns tnt trb tre trn trr trs trt tru tsb tse tsn tsr tss tst tsu ttb tte ttn ttr tts ttt ttu tub tue tun tur tus tut tuu ubb ube ubn ubr ubs ubt ubu ueb uee uen uer ues uet un- unb une unn unr uns unt unu ur- urb ure urn urr urs urt uru usb use usn usr uss ust usu utb ute utn utr uts utt utu uue uun uur uus uut uuu