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\predicatesummary{library_directory}{1}{\hook{user} Directories holding Prolog libraries}
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\predicatesummary{license}{1}{Define license for current file}
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\predicatesummary{license}{2}{Define license for named module}
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\predicatesummary{line_count}{2}{Line number on stream}
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\predicatesummary{line_position}{2}{Character position in line on stream}
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\predicatesummary{list_debug_topics}{0}{List registered topics for debugging}