-er b-u bbb bbe bbm bbo bbr bbs bbt bbu bbx be- beb bee bem beo ber bes bet beu bex bmb bme bmm bmo bmr bms bmt bmu bmx bob boe bom boo bor bos bot bou box brb bre brm bro brr brs brt bru brx bsb bse bsm bso bsr bss bst bsu bsx btb bte btm bto btr bts btt btu btx bub bue bum buo bur bus but buu bux bxb bxm bxo bxx ebb ebe ebm ebo ebr ebs ebt ebu ebx eeb eee eem eeo eer ees eet eex em- emb eme emm emo emr ems emt emu emx eo- eob eoe eom eoo eor eos eot eou erb ere erm ero err ers ert eru es- esb ese esm eso esr ess est esu esx etb ete etm eto etr ets ett etu etx eu- eub eue eur eus eut eux ex- exe exo exr exs ext exu exx m-o m-r mbb mbe mbm mbo mbr mbs mbt mbu mbx meb mee mem meo mer mes met meu mex mmb mme mmm mmo mmr mms mmt mmu mmx mob moe mom moo mor mos mot mou mox mrb mre mrm mro mrr mrs mrt mru mrx msb mse msm mso msr mss mst msu msx mtb mte mtm mto mtr mts mtt mtu mtx mub mue mum mur mus mut muu mux mxr mxs mxu ob- obb obe obm obo obr obs obt obu obx oeb oee oem oeo oer oes oet oex om- omb ome omm omo omr oms omt omu omx oo- oob oom ooo oor oos oot oox or- orb ore orm oro orr ors ort oru orx os- osb ose osm oso osr oss ost osu osx ot- otb ote otm oto otr ots ott otu ou- oue oum ouo our ous out ox- oxb oxo oxt oxx rbb rbe rbm rbo rbr rbs rbt rbu rbx re- reb ree rem reo rer res ret reu rex rmb rme rmm rmo rmr rms rmt rmx rob roe rom roo ror ros rot rou rox rrb rrm rrr rrs rrt rru rsb rse rsm rso rsr rss rst rsu rsx rtb rte rtm rto rtr rts rtt rtu rtx rub rue rum ruo rur rus rut ruu rux rxr rxs sbb sbe sbm sbo sbr sbs sbt sbu sbx se- seb see sem seo ser ses set seu sex smb sme smm smo smr sms smt smu smx sob soe som soo sor sos sot sou sox sr- srb sre srm sro srr srs srt srx ss- ssb sse ssm sso ssr sss sst ssu ssx stb ste stm sto str sts stt stu stx sub sue sum suo sur sus sut suu sux sxm sxs sxt sxu t-x tbb tbe tbm tbo tbr tbs tbt tbu te- teb tee tem teo ter tes tet teu tex tmb tme tmm tmo tmr tms tmt tmu tmx to- tob toe tom too tor tos tot tou tox trb tre trm tro trr trs trt tru trx tsb tse tsm tso tsr tss tst tsu tsx ttb tte ttm tto ttr tts ttt ttu ttx tub tue tum tuo tur tus tut tuu tux txe txs txt txu ubb ube ubo ubr ubs ubt ubu ubx ueb uee uem uer ues uet um- umb ume umm umo umr ums umt umu uob uoe uom uoo uor uos uot uox ur- urb ure urm uro urr urs urt uru urx usb use usm uso usr uss ust usu usx utb ute utm uto utr uts utt utu utx uue uum uur uus uut uuu uxb uxo uxr uxt uxu xbe xbr xbx xee xem xer xes xet xeu xex xmm xmo xmr xms xmt xmu xmx xom xoo xor xos xot xox xrt xrx xsb xsm xss xst xtm xtr xts xtx xue xus xxo xxx