#include <bits/stdc++.h>
using namespace std;
template <typename T> using min_priority_queue = priority_queue<T,vector<T>,greater<T>>;

template<typename T>
void printv(vector<T> &v){
    bool b = false;
    for(auto i : v){
        if(b) cout << " ";
        else b = true;
        cout << i;
    }
    cout << endl;
}

template <typename T>
bool chmin(T &a, const T& b) {
    if (a > b) {
        a = b;  // aをbで更新
        return true;
    }
    return false;
}

template <typename T>
bool chmax(T &a, const T& b) {
    if (a < b) {
        a = b;  // aをbで更新
        return true;
    }
    return false;
}

void yn(bool b){
    if(b) cout << "Yes" << endl;
    else cout << "No" << endl;
}

bool debug;
bool randomInput;
bool debugOutput;
int numOfTestCase;

using ans_type = int;

void input(){
    if(numOfTestCase > 1){
        ;
    }

    if(randomInput){
        
    }
    else{
        
    }
    return;
}

void output_input(){
    ;
}

ans_type calc(){
    int H, W;
    cin >> H >> W;
    vector<string> S(H);
    for(auto &s : S) cin >> s;

    vector<int> v(H+W-2, 1);
    for(int i = 0; i < H-1; i++) v[i] = 0;

    int cnt = 0;
    do{
        int x = 0;
        int y = 0;
        int p = 1;
        bool b = true;
        for(int i = 0; i < H+W-2; i++){
            if(v[i] == 0) x++;
            else y++;
            if(S[x][y] == 'o') p++;
            else if(S[x][y] == 'x') p--;
            else{
                b = false;
                break;
            }
            if(p < 0){
                b = false;
                break;
            }
        }
        if(b) cnt++;
    }while(next_permutation(v.begin(), v.end()));

    cout << cnt << endl;
    return ans_type();
}

ans_type calc_simple(){
    return ans_type();
}

void output(ans_type ans){
    return;
}

int main(){
    debug = 0;
    randomInput = 0;
    debugOutput = 0;
    numOfTestCase = 1;
    srand(time(NULL));
    cout << fixed << setprecision(12);
    
    if(numOfTestCase == 0) cin >> numOfTestCase;

    if(debug){
        for(int i = 0; i < numOfTestCase; i++){
            input();
            ans_type ans = calc();
            ans_type ansSimple = calc_simple();
            if(ans != ansSimple){
                output_input();
                output(ans);
                output(ansSimple);
            }
        }
    }
    else{
        for(int i = 0; i < numOfTestCase; i++){
            input();
            output(calc());
        }
    }

    return 0;
}