correct grammar
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@@ -529,7 +529,7 @@ is unified with a term that contains that variable as a proper
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subterm. For efficiency, the *occurs check* is omitted by default
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in Scryer Prolog and many other Prolog systems.
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In Scryer Prolog, performing unifications which succeed only if the
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In Scryer Prolog, unifications which succeed only if the
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*occurs check* is omitted yield *cyclic terms*, also called
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*rational trees*. For example:
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