I am having difficulty in getting the attached script to work. Compare first Array to second, using a common column (column 1). If there is a match, delete the row in first array.  I also have a line in the comparison to catch a single entry ( "E") and if it exists in first array, delete it as well. In this example the expected result is to have the first array displayed showing only "Dog" and "Frog". I think I understood to start reading from the end of the array , moving to its