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The curators conducted an interesting research project to sample the different papers , working out which papers were machine-made , which were hand-made , and what types of coating the paper had gone through . The bench at the 4th hairpin turn is a reasonable goal for this sample of the trail . All of the price indices listed in this Chapter , are calculated as sample indices - i.e ., their calculation is based on prices of selected representatives ( of both goods and services ) obtained in a sample of reporting units . The project was to verify methods to accurately sample gases . ( There is no restriction on how many bits you use for a sample except that it has to be a multiple of 8 .