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It is not particularly difficult to write a Prolog program that carries out bottom-up active chart parsing.
It is not particularly difficult to write a Prolog program that carries out bottom-up active chart parsing. Indeed, the code is probably slightly simpler than the code for the passive chart parser that we studied in the last chapter. But before we get into it, let's briefly review the built in predicate findall/3 as we are going to make extensive use of it.
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