Write a method that checks if a given String element exists in a List of Strings. The method should return true if the element is found, false otherwise. The comparison should be case-sensitive.
Examples:
Input: items = ['apple', 'banana', 'orange'], element = 'banana'
Output: true
Explanation: 'banana' exists in the list
Input: items = ['car', 'bike', 'train'], element = 'plane'
Output: false
Explanation: 'plane' does not exist in the list
Input: items = ['Hello', 'World'], element = 'hello'
Output: false
Explanation: Case-sensitive comparison - 'hello' != 'Hello'
Input: items = [], element = 'test'
Output: false
Explanation: Empty list contains no elements
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