Correct typo
`bust be an` → `must be a`
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@ -260,7 +260,7 @@ of the corresponding @racket[method-id]s, and replaces the method
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implementation with the result.
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implementation with the result.
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A @racket[props-expr] can provide properties to attach to the
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A @racket[props-expr] can provide properties to attach to the
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impersonator. The result of @racket[props-expr] bust be an list with
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impersonator. The result of @racket[props-expr] must be a list with
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an even number of elements, where the first element of the list is an
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an even number of elements, where the first element of the list is an
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impersonator property, the second element is its value, and so on.
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impersonator property, the second element is its value, and so on.
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