Understanding the GRE
GRE Config File Format
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[1.3b]
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GRE_PATH=/home/dougt/gre/1.3b/
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[1.4a]
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GRE_PATH=/home/dougt/gre/1.4a/
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[1.4b]
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GRE_PATH=/home/dougt/gre/1.4b/