[
    This is for testing i/o; give it a return followed by an EOF. (Try it both
    with file input--a file consisting only of one blank line--and with
    keyboard input, i.e. hit return and then ctrl-d (Unix) or ctrl-z
    (Windows).)
    It should give two lines of output; the two lines should be identical, and
    should be lined up one over the other. If that doesn't happen, ten is not
    coming through as newline on output.
    The content of the lines tells how input is being processed; each line
    should be two uppercase letters.
    Anything with O in it means newline is not coming through as ten on input.
    LK means newline input is working fine, and EOF leaves the cell unchanged
    (which I recommend).
    LB means newline input is working fine, and EOF translates as 0.
    LA means newline input is working fine, and EOF translates as -1.
    Anything else is fairly unexpected.
]
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