-ous bbbb bbbs bmus bobb bobo bobs bobu bomb boms bomu boob boom boor boos bor- borm boro borr bors boru bosm boso boss bosu boum bour bous brob brom broo bror bros brou brrm brrr brrs brsb brsr brum brus bsms bsos bsrm bssm bubb bubo bubs bubu bum- bumb bums bur- burb burm buro burr burs buru buss busu buus mbbs mbms mbou mbrs mbus mmmm mmms mmor mmsu mmus mobb mobo mobs momo moms momu moob moor moos morb moro mors moru moso moss mosu mour mous mrbb mrbm mrbs msmb msmm msms msmu msor msrb mssm mssr msus mubo mubs mumm mumo mums mumu muos muro murr murs muru muso muss musu obbo obor obos obro obsr obss obus ombo ombu omo- omoo omor omro omuo omus ooms oooo ooos oous orbb orbo orbs orbu ormo oro- orom oror oros orro orrs orso orsu orub orum orus osm- osmo osoo osor osos osro ossb osso ossu osum oubs our- ouro ours ouu- rbbb rbbr rbbs rbms rbss rmbs rob- robb robo robs robu romb romm romo roms roob room roor roos roro roru roso ross roub roum rous rrrr rrum rsos rsum rubb rubs rubu rumb rumm rumo rums ruro rurs ruru ruso russ rusu s-os sbbs sbor sbus smos smss smur smus sobo sobr sobs sobu somb somm somo soom soor soos sorb sorm soro sorr sors soru soso soss soum sour sous sros srub ssbr ssrm ssrs sssb sssm ssss sub- subb subm subo subs sum- sumo sums sumu suor suos sur- suro surr surs suru sus- suso suss susu suum suus ubbo ubos umb- umbo ummo umms umor umsu umus uomo uor- urbs uro- urom uroo urso urss ursu urum urur urus usbr usbs usmm usms usos ussb ussr usss ussu usus uuuu