bccup bo-bo boboc bobr bobup bocor booco booru borbo boro- boroo borou borro borup brobo brrrr bucco bucur burcu buroo burro burru buruc c-cor c-p-c c-pop ccccc co-bo co-co co-op cocc- cocco cocur coppo copr- copro copur corbo corbu coro- corop couco courb couru croco croop cropc cropo croup cruor cubo- cubub cuoco cupr- cupro curro curup o-r-b oboro occur ocr-b ooooo opobo orcop orobo oroco oruro ouoro po-po pocop poopo popco popop poppo popup porco porcu poro- porro porur probo proor prop- propp propr pubco pubo- puppo puro- r-co- ro-ro robbo robo- robop robor robur rocco rocor rocou rorbu rprop rubor rubup u-pop ubobo uroob urour urubu urucu uuuuu