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When using a ballpoint pen you sometimes reach a patch of the paper where it just refuses to write but the pen still works perfectly when you try it on another part
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File:Cross section of the unopened fruiting body of the New Zealand basket fungus (Ileodictyon cibarium), next to a ballpoint pen..JPG - Wikimedia Commons
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Reason's you cannot write with a ballpoint pen|よくあるご質問|三菱鉛筆株式会社