Let $n$ be a non-negative integer. Let $n! = 1 \cdot 2 \cdot ... \cdot n~(0! = 1)$ and $$ C_n^{k} = {n! \over k! \cdot (n - k)!} (0 \le k \le n) $$ You are given the numbers $n$ and $k$. Calculate $C_n^{k}$. \InputFile The first line contains the number of test cases $t~(t \le 50)$. Each of the next $t$ lines contains two integers $n$ and $k~(0 \le n < 2^{64}, 0 \le C_n^{k} < 2^{64})$. \OutputFile Print $t$ lines, each contains the value $C_n^{k}$ for corresponding test.