#include <atcoder/all>
using namespace std;
using mint = atcoder::modint1000000007;

int main(){
    ios::sync_with_stdio(false);
    cin.tie(0);
    int h, w;
    cin >> h >> w;
    vector<string> A(h);
    for(auto &&s:A)cin >> s;
    string s0(w, '?');
    for(int i = 0; i < w; i++)s0[i] = (i & 1) + '0';
    auto comp = [&](int y, int state){
        for(int x = 0; x < w; x++){
            if(A[y][x] == '?')continue;
            if(A[y][x] != (s0[x] ^ state))return false;
        }
        return true;
    };
    mint v = comp(0, 0) + comp(0, 1);
    string s1(w, '?');
    bool f = true;
    for(int y = 0; y < h; y++){
        for(int x = 0; x < w; x++){
            if(A[y][x] == '?')continue;
            if(s1[x] == '?'){
                s1[x] = A[y][x] ^ (y & 1);
                continue;
            }
            if(A[y][x] != (s1[x] ^ (y & 1))) f = false;
        }
        if(y) v = comp(y, 0) * v + comp(y, 1) * v;
    }
    A[0] = s1;
    mint ans = v;
    if(f)ans += mint(2).pow(count(s1.begin(), s1.end(), '?')) - comp(0, 0) - comp(0, 1);
    cout << ans.val() << '\n';
}