Notethatinbothcallsofcopy()andcopy_backward(), thethirdargumentisnotpartofthesource range. The program has the following output: source: . . . . . . . . . . a b c d e f . . . . . . . . . . c1: . . . . . . . a b c d e f d e f . . . . . . . . . . c2: . . . . . . . . . . a b c a b c d e f . . . . . . . Athirdexampledemonstrateshowtousecopy()asadatafilterbetweenstandardinputandstandard output. The program reads strings and prints them, each on one line