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\begin{center}\copyright 1984, 1994, and 2004 by \person{Leo Brodie},
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\textbf{Attribution-NonCommercial-ShareAlike 2.0}
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\textbf{You are free:}

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\item to copy, distribute, display, and perform the work
 
\item to make derivative works
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\textbf{Under the following conditions:}

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\item[\vbox to\ht\strutbox{\vss\hbox to 0pt{\hss\includegraphics{img-by} }\vss}Attribution.]
You must give the original author credit.
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\item[\vbox to\ht\strutbox{\vss\hbox to 0pt{\hss\includegraphics{img-nc} }\vss}Noncommercial.]
You may not use this work for commercial purposes.
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\item[\vbox to\ht\strutbox{\vss\hbox to 0pt{\hss\includegraphics{img-sa} }\vss}Share Alike.]
If you alter, transform, or build upon this work, you may distribute
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\item For any reuse or distribution, you must make clear to others the
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\item Any of these conditions can be waived if you get permission from the copyright holder.
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\textbf{Your fair use and other rights are in no way affected by the above.}

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This is a human-readable summary of the Legal Code
{\urlstyle{rm}\def\UrlLeft#1\UrlRight{(the\ full\ license).}
\url{http://creativecommons.org/licenses/by-nc-sa/2.0/legalcode}}

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You can download the electronic version from
\url{http://thinking-forth.sourceforge.net/}

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{\tt ISBN \isbn}
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