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file:./
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file:plan.py
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step:./plan.py
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file:sub/
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file:sub/part1.tex
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file:sub/part2.tex
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step:rr-flatten-latex sub/article_structured.tex sub/article.tex
               state = SUCCEEDED
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            consumes   step:rr-flatten-latex sub/article_structured.tex sub/article.tex
