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Imagine that your brokerage company has modified trade files such that each trade is described by an industry-encoding digit as well as by the price per share and number of shares traded. Here, for example, is a sample file:
0 3.3 300 1 2.5 400 5 9.9 100 5 10.1 500 2 5.0 200
Further imagine that you want to use the industry code to pick out trades of interest, ignoring the rest.