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Exercise 1.1: Modify the echo program to also print os.Args[0], the name of the command that invoked it.

Exercise 1.2: Modify the echo program to print the index and value of each of its arguments, one per line.

Exercise 1.3: Experiment to measure the difference in running time between our potentially inefficient versions and the one that uses strings.Join. (

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Cover of The Go Programming Language

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TODO