-er b-u bbb bbd bbe bbg bbo bbr bbt bbu bdb bdd bde bdg bdo bdr bdt bdu be- beb bed bee beg beo ber bet beu bgb bgd bge bgg bgo bgr bgt bgu bob bod boe bog boo bor bot bou brb brd bre brg bro brr brt bru btb btd bte btg bto btr btt btu bub bud bue bug buo bur but buu dbb dbd dbe dbg dbo dbr dbt dbu ddb ddd dde ddg ddo ddr ddt ddu de- deb ded dee deg deo der det deu dgd dge dgg dgr dgt dgu dob dod doe dog doo dor dot dou drb drd dre drg dro drr drt dru dtb dtd dte dtg dto dtr dtt dtu dub dud due dug duo dur dut ebb ebd ebe ebg ebo ebr ebt ebu ed- edb edd ede edg edo edr edt edu eeb eed eee eeg eeo eer eet egb egd ege egg ego egr egt egu eo- eob eod eoe eog eoo eor eot eou erb erd ere erg ero err ert eru etb etd ete etg eto etr ett etu eu- eub eud eue eug eur eut g-d gbd gbe gbg gbo gbr gbt gbu gdb gdd gde gdo gdr gdt gdu ge- geb ged gee geg geo ger get geu ggb ggd ggg ggo ggr ggt ggu gob god goe gog goo gor got gou grb grd gre grg gro grr grt gru gtb gtd gte gtg gto gtr gtt gtu gu- gub gud gue gug guo gur gut guu ob- obb obd obe obg obo obr obt obu odb odd ode odg odo odr odt odu oeb oed oee oeg oeo oer oet ogd oge ogg ogo ogt oo- oob ood oog ooo oor oot or- orb ord ore org oro orr ort oru ot- otb otd ote otg oto otr ott otu ou- oud oue ouo our out rbb rbd rbe rbg rbo rbr rbt rbu rdb rdd rde rdg rdo rdr rdt rdu re- reb red ree reg reo rer ret reu rgb rgd rge rgg rgo rgr rgt rob rod roe rog roo ror rot rou rrb rrd rrg rrr rrt rru rtb rtd rte rtg rto rtr rtt rtu rub rud rue rug ruo rur rut ruu tbb tbd tbe tbg tbo tbr tbt tbu tdb tdd tde tdg tdo tdr tdt tdu te- teb ted tee teg teo ter tet teu tgb tge tgg tgo tgr tgt tgu to- tob tod toe tog too tor tot tou trb trd tre trg tro trr trt tru ttb ttd tte ttg tto ttr ttt ttu tub tud tue tug tuo tur tut tuu ubb ube ubg ubo ubr ubt ubu udb udd ude udg udo udr udt udu ueb ued uee ueg uer uet ugb uge ugg ugo ugr ugt ugu uob uod uoe uog uoo uor uot ur- urb urd ure urg uro urr urt uru utb utd ute uto utr utt utu uue uug uur uut uuu