because otherwise typechecking would have failed. I'm dubious of that point
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Earth's shadow has two main regions: the outer shadow, called the penumbra, and the inner shadow, known as the umbra. The penumbra causes faint dimming that can be hard to notice. But the umbra is much darker. As it sweeps over the moon, the eclipse becomes obvious and the darkened portion spreads until the entire moon is covered.
Her exhibition - Exercises in Knowing - is now on display at the arts centre in HOME in Manchester until 17 May.