Cycles (Easy)

*Note that this is an easier version of the problem
cycleshard*.

You are given a complete undirected graph with $n$ nodes numbered from 1 to
$n$. You are also given
$k$ *forbidden* edges in this graph.

You are asked to find the number of Hamiltonian cycles in
this graph that donâ€™t use any of the given $k$ edges. A Hamiltonian cycle is a
cycle that visits each vertex exactly once. A cycle that
contains the same *edges* is only counted once.
For example, cycles 1 2 3 4 1 and 1 4 3 2 1 and 2 3 4 1 2 are
all the same, but 1 3 2 4 1 is different.

The first line of input gives the number of cases, $T$. $T$ test cases follow. The first line of each test case contains two integers, $n$ and $k$. The next $k$ lines contain two integers each, representing the vertices of a forbidden edge. There will be no self-edges and no repeated edges.

You may assume that $1 \leq T \leq 10$, $0 \leq k \leq 15$ and $3 \leq n \leq 10$.

For each test case, output one line containing "Case #$X$: $Y$", where $X$ is the case number (starting from 1) and $Y$ is the number of Hamiltonian cycles that do not include any of those $k$ edges. Print your answer modulo 9901.

Sample Input 1 | Sample Output 1 |
---|---|

2 4 1 1 2 8 4 1 2 2 3 4 5 5 6 |
Case #1: 1 Case #2: 660 |