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                The Post Office used to have a strange way of limiting the size 
                of parcels. The maximum allowed was "6 feet combined length and 
                girth". That meant you added together the distance round the middle 
                of the parcel (that's the girth) and the length. I used to imagine 
                sending a fishing rod very nearly 6 feet long and just a few inches 
                round the girth! This problem is more up-to-date. We will call 
                the maximum combined length and girth 2 metres (which is a bit 
                more than 6 feet). What is the greatest volume you can get for 
                a rectangular (cuboid) parcel if the maximum combined length and 
                girth are 2 metres and measurements are all made in whole centimetres? 
                 
               
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