a) shaped to match the rear surface (2a) of the front part (2) so that it is fully engageable with said surface (2a), whereas its rear surface (3b) is locally shaped into a handle (4). Furthermore, the side surfaces of the rear part (3) are aligned with the side surfaces of the front part (2), and the two front (2) and rear (3) parts are made of different materials and/or have different densities.">
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