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Helpful Functions

addFirst(item) - Adds an item to front of LinkedList
addLast(item) - Adds an item to end of LinkedList
addAt(index, item) - Adds an item at the specified index, as long as the specified index is lower than or equal to 7
removeFirst() - Removes the item at the front of the LinkedList
removeLast() - Removes the item at the end of the LinkedList
removeAt(index) - Removes the item at the specified index, as long as the specified index is lower than or equal to 7
contains(item) - Returns true or false depending on if the input is in the LinkedList
clear() - Clears out the LinkedList

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