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+ Consider a set of points on a line. The distance between two points $i$ and $j$ is $|i - j|$.
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+ The point $i$ from the set is the closest to the point $j$ from the set, if there is no other point $k$ in the set such that the distance from $j$ to $k$ is strictly less than the distance from $j$ to $i$. In other words, all other points from the set have distance to $j$ greater or equal to $|i - j|$.
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+ For example, consider a set of points $\\{1, 3, 5, 8\\}$:
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+ * for the point $1$, the closest point is $3$ (other points have distance greater than $|1-3| = 2$); * for the point $3$, there are two closest points: $1$ and $5$; * for the point $5$, the closest point is $3$ (but not $8$, since its distance is greater than $|3-5|$); * for the point $8$, the closest point is $5$.
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+ You are given a set of points. You have to add an integer point into this set in such a way that it is different from every existing point in the set, and it becomes the closest point to every point in the set. Is it possible?
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+ The first line contains one integer $t$ ($1 \le t \le 1000$) — the number of test cases.
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+ Each test case consists of two lines:
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+ * the first line contains one integer $n$ ($2 \le n \le 40$) — the number of points in the set; * the second line contains $n$ integers $x_1, x_2, \dots, x_n$ ($1 \le x_1 < x_2 < \dots < x_n \le 100$) — the points from the set.
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+ For each test case, print YES if it is possible to add a new point according to the conditions from the statement. Otherwise, print NO.
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+ In the first example, the point $7$ will be the closest to both $3$ and $8$.
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+ In the second example, it is impossible to add an integer point so that it becomes the closest to both $5$ and $6$, and is different from both of them.