The blame should be put squarely on the shoulders of tophatter.com. They know the quality of what is being sold and choose to look the other way for the sake of making commission and sales fees on these imitation goods. In my estimation and also the interpretation of the law this is outright FRAUD.
Inverse operations are opposite operations that undo each other. Addition and subtraction are inverse operations. Multiplication and division are inverse operations.
What is Undo/Redo? The Undo and Redo features allow you to easily correct mistakes, as well as free you to experiment with different routing and data mapping decisions. Undo reverses the last action you performed, and Redo undoes the last Undo action. Depending on your computer's resources, MapPoint keeps track of up to ten of your last actions.