{{alias}}()
    Returns a list of simple American-English words (revised Spache).

    Returns
    -------
    out: Array<string>
        List of simple American-English words.

    Examples
    --------
    > var list = {{alias}}()
    [ 'a', 'able', 'about', 'above', ... ]

    References
    ----------
    - Spache, George. 1953. "A New Readability Formula for Primary-Grade Reading
    Materials." *The Elementary School Journal* 53 (7): 410–13. doi:10.1086/
    458513.
    - Klare, George R. 1974. "Assessing Readability." *Reading Research
    Quarterly* 10 (1). Wiley, International Reading Association: 62–102.
    <http://www.jstor.org/stable/747086>.
    - Stone, Clarence R. 1956. "Measuring Difficulty of Primary Reading
    Material: A Constructive Criticism of Spache's Measure." *The Elementary
    School Journal* 57 (1). University of Chicago Press: 36–41.
    <http://www.jstor.org/stable/999700>.
    - Perera, Katherine. 2012. "The assessment of linguistic difficulty in
    reading material." In *Linguistics and the Teacher*, edited by Ronald
    Carter, 101–13. Routledge Library Editions: Education. Taylor & Francis.
    <https://books.google.com/books?id=oNXFQ9Gn6XIC>.

    See Also
    --------