bbbb bbbs bbpr bobb bobo bobs boob boop boor boos boot bopp bops bor- boro borr bors bort boso boss bost botb boto bots bott bovo bpot brob broo bror bros brot brrr brrs brsb brsr brst bsos bspp bspr bsts bstv btbp btob btor btps btrt btss bttb obbo obor obos obot obro obsr obss obst obts obvs oooo ooos oops oort oost ootb ootp oots opo- opor opos oppo opps opto opts orbb orbo orbs oro- oror oros orot orps orro orrs orso orto orts orvr orvs osbp osoo osor osos osov osro ossb osso ostr osts otbs oto- otoo otor otos otov otpp otro otrs otso otto otts ovo- ovoo ovot ovpp pbrs pbsp pobo pobs poop poor poos poot pop- popo popp pops popt porb poro porr pors port posb poso poss post poto pots pott povo povs ppbv ppos pppo pppp ppps ppss ppts pptt pptv prbs pro- prob proo prop pros prot prov prps prrs prso prss prsv prtp prtr psbr psbt psos psov pspp pspr psps psrp psso psst psts pstv psvt ptop pvts rbbb rbbr rbbs rbsp rbss rbst rob- robb robo robs robt roob roop roor roos root ropo rops roro rort roso rosp ross rost roto rotr rots rott rovo rovs rpob rpos rpps rpts rrrr rrsp rsos rspb rspo rsps rstp rsts rsvp rtps rtss rttp rtts rvsp s-os s-vt sbbs sbor sbot sbsp sbst sobo sobp sobr sobs sobt soop soor soos soot sopo sopp sops sorb soro sorr sors sort soso soss sost sosv soto sotp sots sovo sovs spoo spop spor spos spot spps spro sprs spso spsp spss spst sptb spto sptr spts sros srps srpt srsp srtp srtr srtv ssbr ssop ssot sspo ssps sspt ssrs sssb ssss sstb sstp ssts ssvp st-v stbs stob stoo stop stor stos stot stpp stps stro strs stss sttr stvs svor svtr tbbs tbrb tbsp tbst tbtp tobo tobs tobt toor toos toot top- topo topp tops topt topv toro torp torr tors tort torv tosb toso toss tost toto totr tots tott tovo tppp tppr tprs tptp tptr troo trop tros trot trpp trps trpv trst trtr trvs tsob tsop tsos tspo tsps tspt tssr tsst tsts ttbb ttop ttss tttt tvbs tvos tvro tvrr tvss tvtv voor voot vopt vor- voro vors vort voso voss voto votp vpro vrot vrto vsop vsrp vsto vtpr vtrs vvob vvpb vvsb vvvv