bo-bo boboc bobr bocor bogor bogu bogur booco booru borbo borgo borgu boro- boroo borou borro bourg brobo brrrr brugg bucco bucur bugoo burcu burgo burgu buroo burro burru buruc c-cor ccccc co-bo co-co cocc- cocco cocur coorg corbo corbu coro- couco courb couru croco cruor cubo- cubub cuoco curro curug go-go go-oo gobbo gocco gocoo gogro goobo gorgo grgur grogg grrrr grubb gubbo gubru guroo gurro gurur o-r-b oboro occur ocr-b ogogo ogugu ooooo orobo oroco orrgo oruro ouoro r-co- ro-ro robbo robo- robor robur rocco rocor rocou rorbu rubor ubobo ugro- ugrug uroob urour urubu urucu uuuuu