Given a set of digits S, and an integer n, you have to find how many n-digit integers are there, which contain digits that belong to S and the difference between any two adjacent digits is not more than two.

Input starts with an integer T (≤ 300), denoting the number of test cases. Each case contains two integers, m (1 ≤ m < 10) and n (1 ≤ n ≤ 20). The next line will contain m integers (from 1 to 9) separated by spaces. These integers form the set S as described above. These integers will be distinct and given in ascending order.

For each case, print the case number and the number of valid n-digit integers in a single line.

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