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 bpot brob broo bror bros brot brrr brrs brsb brsr brst bsos bspp bspr bsts btbp btob btor btps btrt btss bttb obbo obor obos obot obro obsr obss obst obts 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 osbp osoo osor osos osro ossb osso ostr osts otbs oto- otoo otor otos otpp otro otrs otso otto otts 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 ppos pppo pppp ppps ppss ppts pptt prbs pro- prob proo prop pros prot prps prrs prso prss prtp prtr psbr psbt psos pspp pspr psps psrp psso psst psts ptop 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 rpob rpos rpps rpts rrrr rrsp rsos rspb rspo rsps rstp rsts rtps rtss rttp rtts s-os 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 soto sotp sots spoo spop spor spos spot spps spro sprs spso spsp spss spst sptb spto sptr spts sros srps srpt srsp srtp srtr ssbr ssop ssot sspo ssps sspt ssrs sssb ssss sstb sstp ssts stbs stob stoo stop stor stos stot stpp stps stro strs stss sttr tbbs tbrb tbsp tbst tbtp tobo tobs tobt toor toos toot top- topo topp tops topt toro torp torr tors tort tosb toso toss tost toto totr tots tott tppp tppr tprs tptp tptr troo trop tros trot trpp trps trst trtr tsob tsop tsos tspo tsps tspt tssr tsst tsts ttbb ttop ttss tttt