b-u bbb bbd bbo bbr bbt bbu bdb bdd bdo bdr bdt bdu bob bod boo bor bot bou brb brd bro brr brt bru btb btd bto btr btt btu bub bud buo bur but buu dbb dbd dbo dbr dbt dbu ddb ddd ddo ddr ddt ddu dob dod doo dor dot dou drb drd dro drr drt dru dtb dtd dto dtr dtt dtu dub dud duo dur dut ob- obb obd obo obr obt obu odb odd odo odr odt odu oo- oob ood ooo oor oot or- orb ord oro orr ort oru ot- otb otd oto otr ott otu ou- oud ouo our out rbb rbd rbo rbr rbt rbu rdb rdd rdo rdr rdt rdu rob rod roo ror rot rou rrb rrd rrr rrt rru rtb rtd rto rtr rtt rtu rub rud ruo rur rut ruu tbb tbd tbo tbr tbt tbu tdb tdd tdo tdr tdt tdu to- tob tod too tor tot tou trb trd tro trr trt tru ttb ttd tto ttr ttt ttu tub tud tuo tur tut tuu ubb ubo ubr ubt ubu udb udd udo udr udt udu uob uod uoo uor uot ur- urb urd uro urr urt uru utb utd uto utr utt utu uur uut uuu

bbbb bbdd bbdo bd-r bobb bobo bobu bodb bodo bodu boob bood boor boot bor- bord boro borr bort boru botb botd boto bott boud bour bout brdo brdt brob brod broo bror brot brou brrr brud brut btdt btob btor btrt bttb bubb bubo bubu budb budd budo budu bur- burb burd buro burr burt buru but- buto butt d-bo dbtt dddd ddot ddub dobb dobu dod- dodd dodo doob dood door doot dord doro dorr dort doru dotd doto dott doub doud dour dout drob drod drot drou drub drut druu dtor dtot dub- dubb dubu dudd dudo dudu duo- duro durt duru duur duut obbo obdt obor obot obro obtd odbo oddd odoo odor odot odou odtu odur oooo oord oort ootb orbb orbo orbu ordo ordu oro- oror orot orro orto orub otbd oto- otoo otor otro otto ottu otur our- ouro ourt out- outb outo ouu- rbbb rbbr rob- robb robo robt robu rodd rodo roob rood roor root roro rort roru roto rotr rott roub roud rout rrrr rtdt rubb rubu rudd rudo rurd ruro ruru ruto rutt rutu ruud tbrb tddb tdor tobo tobt tobu todd todo todt todu tood toor toot tord toro torr tort toru totd toto totr tott tour tout trod troo trot trou trtr trub trud trut truu ttbb tttt tubb tubo tubr tubu tudu tuor turb turd turo turr turt turu tuto tutt tutu tuuo ubbo ubod ubud udoo udot uor- urdu uro- uroo urur urut utor utto uttu uuuu

bdoor bdort bo-bo bobr bodd- bodor boord boort booru borbo bordo boro- borod boroo borot borou borro borut botou botro bottu boudu bourd bouto brobo brodd brodo brood broto broud brout brrrr brud- btr-d btr-t buddu budur buord buroo burro burru burtt burud burut butdo buto- butor butot butou butuo butut d-dot d-rod ddddd do-do dobro dodoo dodro doodo doout dordt dorot dorud dotoo dotto doubt douro drbob drobo drood drott drout dtour dubbo duddo dudou durtu o-r-b obodo oboro obout obudu oddur odour odudu oduro ooooo orbot ordro orobo orodo orout ortoo oruro orutu ototo otour ottur oubut ouoro outdo outro outto ro-ro robbo robo- robor robot robrt robur rodbo rodor roodu rorbu roto- rotor rotot rotto roubt routt rubor ruutu tbtbt tbutt to-do tobor tobot tobou todor toord tordu torob torro torto tortu torud toto- totoo tourd touro trood trott trout trubu trudo truro ttttt tubo- tubod tubou tudor tudou tudur tuotu turbo turbt turot turro turtu turut tutor tutto tuuru u-dub ubobo uroob urour urubu urutu utrdb utro- utror uttur uturu ututo uuuuu

bbbbbb booboo borbor bororo botoro boubou boudou bourou boutob brotto brubru brutto bububu burbot burbur burdur burotu burutu butbro buttto buutuo dododo doorto dorbod dorobo dorood dororo dotbot dotdot dotodo doudou dourou doutou doutro drobot drouot dubdub durtro obturb oooooo oordoo ordoru orrour ortrud ottoor outbud outour outtro roboto rorodt rotour rotout rotrou routot rubbot rubout rubro- rubutu rudrur rurutu rutour toboot tootoo torodo tororo tortor tortou totoro totrot toudou tourou toutou toutuo trotro tuotuo turbo- turbot turtur tururu tutour tuttut u-boot udburu utroor

bbbbbbb boo-boo bootout bordour borotou bourout bourrou broudur burdour buttodo buttout dob-dob dobrodo dod-rot dododou doo-doo dortour dourdou oroboro ottrott out-bud outboob outbutt outdoor outroot rootout rootrot rub-out rubbour too-too tortour tototoo touboro touroud tro-tro trotout trubrot turbott tut-tut ububboo

bbbbbbbb bo-bo-bo borborud borututu broubrou buruburu dottodot otor-udu our-burd out-door roboturb toottoot torotoro tourtour turboduo turturro ubbubboo

borborbor borobudur ddddddddd doot-doot dotdotdot totrodrou tuotuorou tuttototo

doortodoor tutortrout

door-to-door

bbbbbbbbbbbbbbb doodoodoodoodoo