# Common Mistakes¶

• forgetting that set replaces the item at the index
• forgetting that remove at an index moves all items that were to the right of that index left one index
• forgetting that add at an index moves everything that was at the index and greater to the right one index
• incrementing an index when looping through a list even though you removed an item from the list
• using nameList[0] instead of nameList.get(0).
• using nameList.length instead of nameList.size() to get the number of elements in a list
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