| http://www.w3.org/ns/prov#value | - here is what all the parts mean: 'cat' is a command which takes a file and outputs its contents to a terminal. '|' takes the terminal output of the program to the left, and rerouts it into the input of the program on the right. 'sort' sorts its input alphanumerically and prints the result into the terminal. '>' takes the output of the program to the left, and places it into the file on the right.
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