-er b-u bbb bbe bbn bbo bbr bbs bbt bbu be- beb bee ben beo ber bes bet beu bev bnb bne bnn bno bnr bns bnt bnu bnv bob boe bon boo bor bos bot bou bov brb bre brn bro brr brs brt bru brv bsb bse bsn bso bsr bss bst bsu bsv btb bte btn bto btr bts btt btu btv bub bue bun buo bur bus but buu bvb bve bvn bvo bvr bvs bvt bvu bvv ebb ebe ebn ebo ebr ebs ebt ebu ebv eeb eee een eeo eer ees eet eev en- enb ene enn eno enr ens ent enu env eo- eob eoe eon eoo eor eos eot eou erb ere ern ero err ers ert eru erv es- esb ese esn eso esr ess est esu esv etb ete etn eto etr ets ett etu etv eu- eub eue eun eur eus eut euv evb eve evn evo evr evs evt evv nbb nbe nbn nbo nbr nbs nbt nbu nbv ne- neb nee nen neo ner nes net neu nev nnb nne nnn nno nns nnt nnu nnv no- nob noe non noo nor nos not nou nov nrb nre nrn nro nrr nrs nrt nru nrv nsb nse nsn nso nsr nss nst nsu nsv ntb nte ntn nto ntr nts ntt ntu ntv nub nue nun nuo nur nus nut nuu nuv nvb nve nvn nvt nvu nvv ob- obb obe obn obo obr obs obt obu obv oeb oee oen oeo oer oes oet on- onb one onn ono onr ons ont onu oo- oob oon ooo oor oos oot oov or- orb ore orn oro orr ors ort oru orv os- osb ose osn oso osr oss ost osu osv ot- otb ote otn oto otr ots ott otu otv ou- oue oun ouo our ous out ov- ovb ove ovo ovs ovv rbb rbe rbn rbo rbr rbs rbt rbu re- reb ree ren reo rer res ret reu rev rnb rnn rno rnr rns rnt rnu rnv rob roe ron roo ror ros rot rou rov rrb rrn rrr rrs rrt rru rsb rse rsn rso rsr rss rst rsu rsv rtb rte rtn rto rtr rts rtt rtu rtv rub rue run ruo rur rus rut ruu ruv rvb rve rvn rvo rvr rvs rvt rvu rvv sbb sbe sbn sbo sbr sbs sbt sbu sbv se- seb see sen seo ser ses set seu sev snb sne snn sno snr sns snt snu snv sob soe son soo sor sos sot sou sov sr- srb sre srn sro srr srs srt srv ss- ssb sse ssn sso ssr sss sst ssu ssv stb ste stn sto str sts stt stu stv sub sue sun suo sur sus sut suu suv svb sve svn svo svr svs svt svu svv tbb tbe tbn tbo tbr tbs tbt tbu tbv te- teb tee ten teo ter tes tet teu tev tnb tne tnn tno tnr tns tnt to- tob toe ton too tor tos tot tou tov trb tre trn tro trr trs trt tru trv tsb tse tsn tso tsr tss tst tsu tsv ttb tte ttn tto ttr tts ttt ttu ttv tub tue tun tuo tur tus tut tuu tuv tvb tve tvn tvo tvr tvs tvt tvu ubb ube ubn ubo ubr ubs ubt ubu ubv ueb uee uen uer ues uet un- unb une unn uno unr uns unt unu unv uob uoe uon uoo uor uos uot ur- urb ure urn uro urr urs urt uru usb use usn uso usr uss ust usu usv utb ute utn uto utr uts utt utu utv uue uun uur uus uut uuu uvb uve uvo uvs uvu uvv v-e vbo vbr vbs vbv veb vee ven veo ver ves vet veu vn- vno vnr vns vnu vnv vob voe von voo vor vos vot vou vov vrb vre vrn vrr vrs vrt vru vsb vse vsn vso vsr vss vst vsu vsv vtb vte vto vtr vts vtt vtu vtv vue vur vus vut vuv vvb vvo vvr vvs vvt vvv