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Typos for TypeScript 3.9.md

Line	Typo
52	tion speed with packages like material-ui and styled-components.
63	ved around a 40% reduction in material-ui's compile time!
168	t/pull/36402) from [Alexander Tarasyuk](https://github.com/a-tarasyu
199	he SDK installers above] and [MSBuild installs](https://www.nuget.o
213	Plenty of users still use CommonJS-style require(...) imports like s
227	TypeScript's refactorings and quick fixes often didn't
300	26434) from community member [Wenlu Wang](https://github.com/King
371	enforce this rule to be more conformant.
374	36) enforcing this from [Brad Zacher](https://github.com/bradzache
389	fix, and thanks to [Alexander Tarasyuk](https://github.com/a-tarasyu
473	pull/32264) from GitHub user [pathurs](https://github.com/pathurs),
502	### More libdom.d.ts refinements
504	ore of TypeScript's built-in .d.ts library (lib.d.ts and family)
504	ipt's built-in .d.ts library (lib.d.ts and family) to be generated f

Typos for Generics.md

Line	Typo
209	ot possible to create generic enums and namespaces.
434	[Covariance and contravariance](https://en.wikipedia.org/wik
453	This relationship is called contravariance: the relationship from `Cons
454	ed to covariance! This is why contravariance "cancels itself out" but cova
456	TypeScript's, covariance and contravariance are naturally emergent behavi
456	riance are naturally emergent behaviors that follow from the definiti
457	, we would see covariant (and contravariant) relationships:
536	ariance annotations to change typechecking behavior; this is not what th
549	ou're trying to maximize your typechecking performance, and have run a
551	ariance annotations to change typechecking behavior; this is not what th

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