#include <bits/stdc++.h>
using namespace std;
using i64 = long long;
const i64 mod = 1000000007;
void solve() {
    int n,m;
    cin >> n >> m;
    vector G(m,vector<int>(0));
    vector g(n,vector<int>(0));
    for ( int i = 0 ; i < n ; i++ ) {
        string s;
        cin >> s;
        for ( int j = 0 ; j < m ; j++ ) {
            if ( s[j] == '1' ) {
                g[i].emplace_back(j);
                if ( j != m-1-j ) g[i].emplace_back(m-1-j);
                G[j].emplace_back(i);
                if ( j != m-1-j ) G[m-1-j].emplace_back(i);
            }
        }
    }
    for ( int i = 0 ; i < m ; i++ ) {
        if ( i == m/2 && m%2 == 1 ) {
            if ( G[i].size() >= 2 ) {
                cout << 0 << '\n';
                return;
            }
        } else {
            if ( G[i].size() >= 3 ) {
                cout << 0 << '\n';
                return;
            }
        }
    }
    i64 res = 1;
    vector<int>vis(n,-1);

    for ( int i = 0 ; i < n ; i++ ) {
        if ( vis[i] == -1 ) {
            queue<pair<int,int>>q;
            q.emplace(i,0);
            vis[i] = 0;
            while ( q.size() ) {
                auto [u,cur] = q.front();
                q.pop();
                for ( auto k : g[u] ) {
                    for ( auto v : G[k] ) {
                        if ( u == v ) continue;
                        if ( vis[v] != (cur^1) ) {
                            if ( vis[v] != -1 ) {
                                cout << 0 << '\n';
                                return;
                            }
                            vis[v] = cur^1;
                            q.emplace(v,cur^1);
                        }
                    }
                }
            }
            res = res*2%mod;
        }
    }
    cout << res << '\n';
}
int main() {
    ios::sync_with_stdio(0);
    cin.tie(0), cout.tie(0);
    int T = 1;
    cin >> T;
    while ( T-- ) {
        solve();
    }
}