is nil the same as na? I do not know.
git-svn-id: https://middleangle.com/svn/rif/projects/RCLG@260 97840717-62f2-0310-bead-daafb7b60902
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git-svn-id: https://middleangle.com/svn/rif/projects/RCLG@260 97840717-62f2-0310-bead-daafb7b60902