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#1 Nylon
#2 White sugar
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#3 Fine salt
#4 Peppercorn
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#5 Ground black pepper
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#6 Coffee grounds
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#7 Wood
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#8 Ballpoint pen
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#9 Printed paper
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#10 A staple in some paper
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#11 A grain of pollen
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#12 Pollen caught in fabric
#13 Needle and thread
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#14 The edge of a razor blade
#15 A moustache hair
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#16 Lots of moustache hairs
#17 The surface of an old copper penny
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#18 A fruit fly
#19 More of a fruit fly
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#20 A cloth
#21 The surface of a ball bearing
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#22 The sticky bit of a post-it note
#23 Cotton
