book: make it one sentence
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@ -46,7 +46,7 @@ This will print `12.566371`.
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We've made a struct that represents a circle. We then write an `impl` block,
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and inside it, define a method, `area`. Methods take a special first
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parameter, `&self`. There are three variants: `self`, `&self`, and `&mut self`.
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parameter, of which there are three variants: `self`, `&self`, and `&mut self`.
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You can think of this first parameter as being the `x` in `x.foo()`. The three
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variants correspond to the three kinds of thing `x` could be: `self` if it's
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just a value on the stack, `&self` if it's a reference, and `&mut self` if it's
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