Clarify exercises in README

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Tony Morris 2015-05-19 09:28:42 +10:00
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![NICTA](http://i.imgur.com/sMXB9XB.jpg)
### Abstract
Let's Lens presents a series of exercises, in a similar format to
@ -21,6 +20,9 @@ best to start at the `Lets.GetSetLens` module. If you wish to derive the
structure of lenses from first principles, then derive the more modern theories,
start at the `Lets.Lens.Lens` module.
Exercises can be recognised by filling in a function body that has a placeholder
of `error "todo: <function-name>"`.
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### Exercise modules