Commita15e5bd

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fix typo

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Original file line number	Diff line number	Diff line change
`@@ -857,7 +857,7 @@ So we build a 2D Segment Tree: first the Segment Tree using the first coordinate`
`857`	`857`
`858`	`858`	`To make the construction process more understandable, you can forget for a while that the matrix is two-dimensional, and only leave the first coordinate.`
`859`	`859`	`We will construct an ordinary one-dimensional Segment Tree using only the first coordinate.`
`860`		`-But instead of storing a number in a segment,be store an entire Segment Tree:`
	`860`	`+But instead of storing a number in a segment,we store an entire Segment Tree:`
`861`	`861`	`i.e. at this moment we remember that we also have a second coordinate; but because at this moment the first coordinate is already fixed to some interval $[l \dots r]$, we actually work with such a strip $a[l \dots r, 0 \dots m-1]$ and for it we build a Segment Tree.`
`862`	`862`
`863`	`863`	`Here is the implementation of the construction of a 2D Segment Tree.`

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