-ous bbbb bbbs bffs bfsr bmus bobb bobo bobs bobu boff bofs bofu bomb boms bomu boob boof boom boor boos bor- borf borm boro borr bors boru bosm boso boss bosu bouf boum bour bous brfm brfu brob brom broo bror bros brou brrm brrr brrs brsb brsr brum brus bsff bsfs bsms bsos bsrm bssm bubb bubo bubs bubu buff bufo bufr bum- bumb bumf bums bur- burb burm buro burr burs buru buss busu buus fbom fbrs fbus ffff ffrr ffss fmsr fmss fobs fofo fomo foof foom foos for- forb form foro forr fors fosb foso foss four fous frob from fros frou frsb frsm frso frub frum fsfo fssf fubb fubs fubu fuff fufu fumo fums fuor fur- furm furo furr furs fuso fuss fusu mbbs mbms mbou mbrs mbsf mbus mfbm mfor mfou mfrs mfsb mmff mmmm mmms mmor mmrf mmsu mmus mobb mobo mobs moff mofo mofu momo moms momu moob moor moos morb morf moro mors moru moso moss mosu mouf mour mous mrbb mrbm mrbs msff msfs msmb msmm msms msmu msor msrb mssf mssm mssr msus mubo mubs muff mufu mumm mumo mums mumu muos muro murr murs muru muso muss musu obbo obor obos obro obsr obss obus off- offo offr offs offu ofor ofus ombo ombu omo- omoo omor omro omuo omus ooff oofs ooms oooo ooos oous orbb orbo orbs orbu orff orfs orfu ormo oro- orof orom oror oros orro orrs orso orsu orub orum orus osm- osmo osoo osor osos osro ossb osso ossu osum oubs ouff our- ouro ours ouu- rbbb rbbr rbbs rbms rbss rmbs rob- robb robo robs robu roff rofo romb romm romo roms roob roof room roor roos roro roru roso ross roub rouf roum rous rrrr rrum rsos rsum rubb rubs rubu ruff rufo rumb rumm rumo rums ruro rurs ruru ruso russ rusu s-os sbbs sbor sbus sfmm sfor sfos sfro sfss sfsu smbf smof smos smrf smss smur smus sobo sobr sobs sobu sofo somb somm somo soof soom soor soos sorb sorm soro sorr sors soru soso soss souf soum sour sous sros srub ssbr ssrm ssrs sssb sssf sssm ssss sub- subb subm subo subs suf- suff sufr sufs sufu sum- sumo sums sumu suor suos sur- surf suro surr surs suru sus- suso suss susu suum suus ubbo ubos ufms ufos umb- umbo umff ummo umms umor umsu umus uofm uofo uomo uor- urbs urff uro- urom uroo urso urss ursu urum urur urus usbr usbs usfs usmm usms usos ussb ussf ussr usss ussu usus uuuu