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file:./
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file:plan.py
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step:runpy ./plan.py
               state = SUCCEEDED
             env_var = STEPUP_PATH_FILTER [amended]
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file:source/
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file:source/demo.md
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dg:common/**
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step:convert-markdown source/demo.md source/demo.html
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             env_var = REPREP_MARKDOWN_CSS [amended]
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file:source/demo.html
               state = BUILT
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            consumes   file:source/
            consumes   step:convert-markdown source/demo.md source/demo.html
