Beautiful errors: van de trap
You can learn from errors, especially when the errors are beautiful and/or hilarious. This way, it’s easier not to make these errors (again).
“Ze valt van de trappen.”

This should be:

“Ze valt van de trap.”
Because:
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de trap |
twee trappen
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|
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de trede (2 treden) or de tree (2 treeën) |