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Clarify exercises in README
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### Abstract
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Let's Lens presents a series of exercises, in a similar format to
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best to start at the `Lets.GetSetLens` module. If you wish to derive the
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structure of lenses from first principles, then derive the more modern theories,
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start at the `Lets.Lens.Lens` module.
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Exercises can be recognised by filling in a function body that has a placeholder
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of `error "todo: <function-name>"`.
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----
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