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Problem 2 (20 points): Implement the following methods: a) A method named isSorted with the following signature that gets a linked list of Strings and checks whether the list is alphabetically sorted. The method must return true if the list is sorted and return false otherwise. public static boolean isSorted (LinkedList list) b) A method with the following signature that gets a linked list of Strings and starting from the second node, deletes all alternate nodes of it. The method returns a clone of the shortened linked list as the output. public static LinkedList deleteAlt (LinkedList list)