-ous bbbb bbbs bbpr bobb bobo bobs bobu boob boop boor boos bopp bops bor- boro borr bors boru boso boss bosu boup bour bous bpsu brob broo bror bros brou brrr brrs brsb brsr brup brus bsos bspp bspr bsup bubb bubo bubs bubu bups bur- burb buro burp burr burs buru buss busu buus obbo obor obos obro obsr obss obus oooo ooos oops oous opo- opor opos oppo opps opsu opus orbb orbo orbs orbu oro- oror oros orps orro orrs orso orsu orub orup orus osbp osoo osor osos osro ossb osso ossu oubs our- ouro ours ouu- pbrs pbsp pobo pobs poop poor poos pop- popo popp pops porb poro porr pors posb poso poss poup pour pous ppos pppo pppp ppps ppru ppss ppur prbs pro- prob proo prop pros prou prps prrs prso prss prus pruu psbr psos psou pspp pspr psps psrp psso pubs pubu pups pupu pur- purb puro purp purr purs puru puss rbbb rbbr rbbs rbsp rbss rob- robb robo robs robu roob roop roor roos ropo rops roro roru roso rosp ross roub roup rous rpob rpos rpps rrrr rrsp rsos rspb rspo rsps rubb rubp rubs rubu rupp ruro rurp rurs ruru ruso russ rusu s-os sbbs sbor sbsp sbus sobo sobp sobr sobs sobu soop soor soos sopo sopp sops sopu sorb soro sorr sors soru soso soss soup sour sous spoo spop spor spos spps spro sprs spso spsp spss spur spus sros srps srsp srub ssbr ssop sspo ssps ssrs sssb ssss sub- subb subo subs suor suos sup- supo supp supr sups sur- suro surp surr surs suru sus- suso susp suss susu suus u-rp ubbo ubos uor- upor upos uppp uppu upup urbs uro- uroo urpo urso urss ursu urup urur urus usbr usbs usos uspo uspp usps ussb ussr usss ussu usus uuuu