b-p bbb bbd bbo bbp bbr bbt bdb bdd bdo bdp bdr bdt bob bod boo bop bor bot bpb bpd bpo bpp bpr bpt brb brd bro brp brr brt btb btd bto btp btr btt dbb dbd dbo dbp dbr dbt ddb ddd ddo ddp ddr ddt dob dod doo dop dor dot dpb dpd dpo dpp dpr dpt drb drd dro drp drr drt dtb dtd dto dtp dtr dtt ob- obb obd obo obp obr obt odb odd odo odp odr odt oo- oob ood ooo oop oor oot op- opb opd opo opp opr opt or- orb ord oro orp orr ort ot- otb otd oto otp otr ott p-p pbb pbd pbo pbp pbr pbt pdb pdd pdo pdp pdr pdt pob pod poo pop por pot ppb ppd ppo ppp ppr ppt prb prd pro prp prr prt pt- ptb ptd pto ptp ptr ptt rbb rbd rbo rbp rbr rbt rdb rdd rdo rdp rdr rdt rob rod roo rop ror rot rpb rpd rpo rpp rpr rpt rrb rrd rrp rrr rrt rtb rtd rto rtp rtr rtt tbb tbd tbo tbp tbr tbt tdb tdd tdo tdp tdr tdt to- tob tod too top tor tot tpb tpd tpo tpp tpr tpt trb trd tro trp trr trt ttb ttd tto ttp ttr ttt

bbbb bbdd bbdo bbpr bd-r bobb bobo bodb bodo boob bood boop boor boot bopp bor- bord boro borr bort botb botd boto bott bpot bprd brdo brdt brob brod broo bror brot brrr btbp btdt btob btor btrt bttb d-bo dbpd dbtt dddd ddot ddpo dobb dod- dodd dodo doob dood doop door doot dopo dopp dopr dopt dord doro dorp dorr dort dotd doto dott dpdt drob drod drop drot dtdp dtor dtot dttp obbo obdt obor obot obro obtd odbo oddd odoo odop odor odot odrp oooo oord oort ootb ootp opo- opor oppo opto orbb orbo ordo oro- oror orot orro orto otbd oto- otoo otor otpp otro otto pdpr pobo pod- podd podo pood poop poor poot pop- popo popp popt porb poro porr port potd poto pott ppod pppd pppo pppp pptt pro- prob prod proo prop prot prpd prrd prtp prtr ptop ptpd ptrd rbbb rbbr rdbp rob- robb robo robt rodd rodo roob rood roop roor root ropo roro rort roto rotr rott rpdp rpob rptd rrrr rtdt rttp tbrb tbtp tddb tdor tobo tobt todd todo todt tood toor toot top- topd topo topp topt tord toro torp torr tort totd toto totr tott tppd tppp tppr tptp tptr trod troo trop trot trpp trtr ttbb ttop tttt

bdoor bdort bo-bo bobr bodd- bodor boord boort borbo bordo boro- borod boroo borot borro botro brobo brodd brodo brood broto brrrr btr-d btr-t d-dot d-rod ddddd do-do dobro dodoo dodro doodo dordt dorot dotoo dotto drbob drobo drood droop drop- dropo dropt drott o-r-b obodo oboro ooooo oopod opobo opodo opto- optot optto orbot ordro orobo orodo ortoo ototo otpor po-po podo- podob podor poopo poort popop poppo poro- porro porto potoo potop potor potro potto probo prodd proor proot prop- propp propr propt prot- proto prtor ptprb ptprd ptpro ptprr ptprt ro-ro robbo robo- robop robor robot robrt rodbo rodor roto- rotor rotot rotto rprop rptor t-pop t-top tbtbt to-do tobor tobot todor toord topbt topo- topor topot toppo toptb topto torob torpo torro torto toto- totoo totop tprot trood troop trop- tropo trott ttttt

bbbbbb booboo borbor bororo botoro brotto dododo doorto dorbod dorobo dorood doropo dororo dotbot dotdot dotodo drobot dropto oooooo oordoo opdorp oporto optoro ottoor poopoo popbot popopo poporo poppop poptop pottop pppppp ppt-db probot proto- roboto rorodt toboot tootoo toppop torodo tororo torpor tortor totopo totoro totrot tropo- troppo trotro

bbbbbbb boo-boo bottrop dob-dob dobrodo dod-rot doo-bop doo-doo droptop oroboro ottrott poo-poo pop-top potoroo prodrop proport rob-pot robopop rootrot too-too topboot tototoo tro-tro

bbbbbbbb bo-bo-bo boot-top dottodot poorpoor poroporo protopod toottoot top-boot top-root torotoro

borborbor ddddddddd doot-doot dotdotdot poto-poto proprotor

doortodoor

potoooooooo

door-to-door toptoptoptop

bbbbbbbbbbbbbbb doodoodoodoodoo