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Update matrix rotation README.

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Original file line number	Diff line number	Diff line change
`@@ -80,9 +80,29 @@ diagonal top-right/bottom-left rotation along with horizontal`
`80`	`80`	`rotation.`
`81`	`81`
`82`	`82`	```
`83`		`-A B C A - - . . A`
`84`		`-/ / --> B - - --> . . B`
`85`		`-/ . . C - - . . C`
	`83`	`+Let's say we have a string at the top of the matrix:`
	`84`	`+`
	`85`	`+A B C`
	`86`	`+• • •`
	`87`	`+• • •`
	`88`	`+`
	`89`	`+Let's do top-right/bottom-left diagonal reflection:`
	`90`	`+`
	`91`	`+A B C`
	`92`	`+/ / •`
	`93`	`+/ • •`
	`94`	`+`
	`95`	`+And not let's do horizontal reflection:`
	`96`	`+`
	`97`	`+A → →`
	`98`	`+B → →`
	`99`	`+C → →`
	`100`	`+`
	`101`	`+The string has been rotated to 90 degree.`
	`102`	`+`
	`103`	`+• • A`
	`104`	`+• • B`
	`105`	`+• • C`
`86`	`106`	```
`87`	`107`
`88`	`108`	`## References`

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