It is oftentimes advantageous to be able to transfer data between multiple lists while rearranging their order. For instance, say that list1 = [1,2,3,4,5,6,7,8,9] and you wish to add the numbers in the index range 4:7 of list1 to another list, list2, in reverse order while simultaneously removing them from list1. If list2 = [100,200], the result will be list2 = [100,200,7,6,5]. Write a function named transform that takes as arguments list1, list2, r1, and r2, that removes items from list1 in the slice r1:r2, appends them onto list2 in reverse order, and returns the resulting list. For example, in this case, the function call will be transform(list1, list2, 4,7).
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