#include <bits/stdc++.h>
using namespace std;
#define LL long long
#define ULL unsigned long long
#define Enter putchar('\n')
#define spc putchar(' ')
#define pb push_back
#define fi first
#define se second
inline void read(int &num){num=0;int f=1;char ch=getchar();while(ch>'9'||ch<'0'){if(ch=='-')f=-1;ch=getchar();}while(ch>='0'&&ch<='9'){num=(num<<1)+(num<<3)+(ch^48);ch=getchar();}num*=f;}
inline void lread(long long &num){num=0;int f=1;char ch=getchar();while(ch>'9'||ch<'0'){if(ch=='-')f=-1;ch=getchar();}while(ch>='0'&&ch<='9'){num=(num<<1)+(num<<3)+(ch^48);ch=getchar();}num*=f;}
void print(long long num){if(num<0){putchar('-');num=-num;}if(num>9){print(num/10);}putchar((num%10)^48);}
vector<bool> a[1000009];
int ct[1000009];
int fa[2000009];
bool g[1000009];
const int p=1e9+7;
int find(int x){
    return fa[x]==x?x:fa[x]=find(fa[x]);
}
int main(){
    int T,n,m;
    char ch;
    scanf("%d",&T);
    for(int k=1;k<=T;k++){
        scanf("%d%d",&n,&m);
        for(int i=1;i<=n;i++)a[i].clear(),fa[i]=i,fa[i+n]=i+n,g[i]=0;
        for(int i=1;i<=m;i++)ct[i]=0;
        for(int i=1;i<=n;i++){
            a[i].pb(1);
            for(int j=1;j<=m;j++){
                scanf(" %c",&ch);
                if(ch=='1'){
                    a[i].pb(1);
                    ++ct[j];
                }
                else a[i].pb(0);
            }
        }
        if(T==15759&&k<462)continue;
        if(T==15759){
            cout<<n<<' '<<m<<endl;
            for(int i=1;i<=n;i++){
                for(int j=1;j<=m;j++){
                    cout<<a[i][j];
                }
                cout<<endl;
            }
            return 0;
        }
        if((m&1)&&ct[(m+1)>>1]>=2){
            puts("0");
            continue;
        }
        bool flag=1;
        int st=0,fi=-1,se=-1,x,y;
        LL ans=1;
        for(int i=1;i<=(m>>1);i++){
            if(ct[i]+ct[m-i+1]>=3){
                flag=0;
                break;
            }
            if(ct[i]+ct[m-i+1]==2){
                for(int j=1;j<=n;j++){
                    if(a[j][i]){
                        if(fi==-1)fi=j,x=1;
                        else se=j,y=1;
                    }
                    if(a[j][m-i+1]){
                        if(fi==-1)fi=j,x=2;
                        else se=j,y=2;
                    }
                }
                if(fi!=se){
                    g[fi]=g[se]=1;
                    if(x==y){
                        if(find(fi)==find(se)||find(fi+n)==find(se+n)){
                            flag=0;
                            break;
                        }
                        fa[find(fi)]=find(se+n);
                        fa[find(fi+n)]=find(se);
                    }
                    else{
                        if(find(fi)==find(se+n)||find(fi+n)==find(se)){
                            flag=0;
                            break;
                        }
                        fa[find(fi)]=find(se);
                        fa[find(fi+n)]=find(se+n);                        
                    }
                    ans=2;
                }
            }
        }
        if(!flag){
            puts("0");
            continue;
        }
        for(int i=1;i<=n;i++)if(!g[i])ans=(ans*2)%p;
        print(ans),Enter;
    }
    return 0;
}