Even as a native speaker I still have the occasional slip up when it comes to the following words: sixths, particularly and rural.
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Rural
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It really depends on where you're from. I don't know much about Finnish..
But from my own experience;
- world
- strength
- thirty-three
- february
- squirrel
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Words like pseuydonym, route or conspicuous because everyone says them differently so I never know whats really the right way to say them