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[https://drive.google.com/open?id=1OyVApbUD-51nb0n9ggCSIGr_2pfYIBEKSAg25fOMJ8k Green Valley PB Negative Case]
[https://drive.google.com/open?id=0B6eBG-2dQRoEeDd4TzVJSkNXak0 Green Valley PB Blocks to Negative Arguments]
April 2017