Copyright 1993,1998,2014 Toyoda Masashi (mtoyoda@acm.org)

Everyone is permitted to do anything on this program including copying,
modifying, and improving, unless you try to pretend that you wrote it.
i.e., the above copyright notice has to appear in all copies.
THE AUTHOR DISCLAIMS ANY RESPONSIBILITY WITH REGARD TO THIS SOFTWARE.

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Gentoo license note: The author has confirmed that this license allows
distribution of modified code: https://github.com/mtoyoda/sl/issues/52