let is like temp but it's only useful inside of rules. If the rule succeeds, then the variable keeps the hypothesized value. If the rule fails, then the variable loses its hypothesized value and thus reverts back to whatever value it had before (if any).
This is all as far as I know anyway. But then, things I thought I knew about rules have changed at least 2 times since I learned them, so who really knows anyway? ;-)
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