unimplemented functions; your task
                is to implement each one according to the docstring provided.
                No local tests are provided, but you can run the autograder to
                check your work. Unlimited submissions are permitted and the
                most recent score will be used to determine your grade.

                <a class="button" href="template.py" >Download template.py</a>
            </section>
            <section class="submission">
                <h2>Submit 