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- Thismaterialisimpervioustorainwater.Itdispelsthenotionthattheplantsareimpervious.Howdotheytrainthemselvestobesoimpervioustoreality?Wearapprovedrespirator,protectiveclothing,safetygogglesandchemicallyimperviousgloves.Bywonderfulgoodfortune,Sr31alsoboo...
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