LoadingTime got a RNG (Random Number Generator) from his classmate several weeks ago. And he spent a lot of time study it. He found that RNG can generate a real number in range [-S,S] by executing following steps. First RNG generates n integer X₁..X_n, the sum of which is equal to S. Then for each X_i, it generates a real number in range [-X_i,X_i] randomly. The output (a real number) of RNG will be the sum of the N generated real numbers. LoadingTime noticed that the distribution of the output was very interesting, and he wanted to know: for given N and X, what's the probability that the generated number is in range [A,B]. Could you help him?

Input

The first line contains an integer T representing the number of test cases.

For each test case, the first line contains three integers N, A, B(1 ≤ N ≤ 10, -100 ≤ A ≤ B ≤ 100) In the second line of the test case, you are given X₁...X_n(1 ≤ X_i ≤ 10).

Output

For each test case, print a line contains a real number representing the probablity as the problem required. It must be printed with exactly nine decimal places.

Example

Input:
5
1 -100 100
10
1 10 90
10
1 -20 5
10
2 -20 5
5 5
5 -5 10
1 2 3 4 5

Output:
1.000000000
0.000000000
0.750000000
0.875000000
0.864720052