I find the terms "twofold" and "threefold" (and all the other -folds) misleading.
Fold a piece of paper in half. How many sides do you have? 2. How many folds is that? 1.
Fold that same piece of paper in half again. How many sides do you have now? 4. How many folds is that? 2.
Again. How many sides? 8. How many folds? 3.
"X-fold" shouldn't
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