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Figure 52 comprises three photographs labelled 'a', 'b' and 'c'. Photograph 'a' shows an open flat horizontal hand filled with sand and a sandy rock strewn surface below it. Photograph 'b' shows a hand holding the end of an optical fibre cable and photograph 'c' is a close up of two fingers holding the corner of a small printed circuit board that is connected to an optical fibre cable.