Answer:
Say you have a key in a dictionary, or a key in a 2-d list. When you insert(), you are destructively iterating the original list and modifying it to reflect the insert() component. In order for the key to get lost you would have to do say insert(len: :1) which would remove the second key and therefore cause it to get "lost" because it will be destructivsly removed from its assignment and replaced by whatever you choose to insert.
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Answer:
My Computer>>Properties>>Device Manager>>Video Card Properties>>Drivers Tab>>Roll Back Driver.
Explanation:
The user can do so by reverting the driver to the previous version, The correct process to do so is by the Right Clicking on the computer menu and clicking device manager from the properties. In the device manager, click the properties of the video card and select the Drivers tab. In the Drivers tab, click on the Roll Back Driver. This will restore to the previous driver.