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Why Do Pen Lids Have Holes
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Real reason for tiny holes in biro pen lids: 'Wow'
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Why Pen Caps Have Holes in Them - ATTN:
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You'll Never Guess Why Pen Caps Have Holes. This Is Absolute Genius! - ScoopWhoop
Why do pen caps have holes? Ever Wondered why???
There's A Surprising Reason Why Pen Caps Have Holes In Them | IFLScience
You Know That Little Hole in Your Pen Cap? It Could Save Your Life | Gear Patrol
Find Out the Surprising Reason There Is a Hole in the Top of Your Pen Cap
