sgithens

;;;;
;;;;      Boxer
;;;;      Copyright 1985-2022 Andrea A. diSessa and the Estate of Edward H. Lay
;;;;
;;;;      Portions of this code may be copyright 1982-1985 Massachusetts Institute of Technology. Those ;;;;  portions may be
;;;;      used for any purpose, including commercial ones, providing that notice of MIT copyright is ;;;;  retained.
;;;;
;;;;      Licensed under the 3-Clause BSD license. You may not use this file except in compliance with ;;;;  this license.
;;;;
;;;;      https://opensource.org/licenses/BSD-3-Clause