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Why are multiplicity markers generally placed on one end of a composition relationship, but on both ends of an aggregation relationship? Write a program that

Why are multiplicity markers generally placed on one end of a composition relationship, but on both ends of an aggregation relationship?

Write a program that copies an input file to an output file, extracting only the numbers that are in the input file and placing them in the output file, one number on each line. Use the StreamTokenizer class to extract the tokens that are numbers.

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