6p20.cpp


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/*
 *
 * 6.20
 *
 *
 */

int main () {

	/*
	  We should do it when we only need to read the data.
	  There is no point accidentally writing to something we did not intend to write to.
	  Because if we had used const we would not be allowed to.
	 */
	return 0;
}