Hello, can anyone help me create a use cases diagram with the instructions below? Thank you!

Create a dictionary of forty common computer terms and their definitions. The user enters a computer term and the program returns the definition. It should not matter whether the user enters the term in upper case, lower case, or a mix of both. If the term is not in the dictionary, the program should let the user know rather than crash with an error condition. Users can look up terms. Administrators can look up terms, enter new terms, or remove terms