123It must be held that, when the opposition to a Community trade mark application is based on several earlier marks and those marks display characteristics which give grounds for regarding them as forming part of a single ‘series’ or ‘family’, which may be the case, inter alia, either when they reproduce in full a single distinctive element with the addition of a graphic or word element differentiating them from one another, or when they are characterised by the repetition of a single prefix or suffix taken from an original mark, such a circumstance constitutes a relevant factor for the purpose of assessing whether there is a likelihood of confusion.