bbbb bbbs bffs bfsr bobb bobo bobs boff bofs bojo boob boof boor boos bor- borf borj boro borr bors boso boss brob broo bror bros brrr brrs brsb brsr bsff bsfs bsos fbrs ffff ffrr ffss fobs fofo foof foos for- forb forj foro forr fors fosb foso foss frob fros frsb frso fsfo fssf j-ro jbob jffs jobo jobs jofr jojo joof joor joos jorf joro joso joss jrbr jssr jsss obbo obor obos obro obsr obss off- offo offr offs ofor ojos ooff oofs oooo ooos orbb orbo orbs orff orfs oro- orof oror oros orro orrs orso osoo osor osos osro ossb osso rbbb rbbr rbbs rbss rob- robb robo robs roff rofo rojo rojs roob roof roor roos roro roso ross rrrr rsos s-os sbbs sbor sfor sfos sfro sfss sobo sobr sobs sofo soof soor soos sorb soro sorr sors soso soss sros ssbr ssrs sssb sssf ssss