You tearing the fibers, weakening all the ones around them allowing for cuts to form more easily all cuts are are really small tears across a larger area. If you can start somewhere there is already a year the rest will follow suit. Think of it how if there is a crack in the wood you’re trying to split, you’d want to follow the crack for the least amount of effort. Or if once you crack glass, it’s more likely to not only crack again but almost always along the crack already made.
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