#include <iostream>
#include <vector>

using namespace std;

void log_array(const vector<bool>& arr, const string& name) {
    clog << name << ": ";
    for (const auto& cell : arr) {
        clog << cell << " ";
    }
    clog << endl;
}

vector<vector<bool>> get_grid(const int size) {
    vector<vector<bool>> grid;
    for (int _ = 0; _ < size; _++) {
        string pattern;
        vector<bool> row;
        cin >> pattern;
        for (const char c : pattern) { row.push_back(c != '.'); }
        grid.push_back(row);
    }
    return grid;
}

long long dfs(const vector<vector<bool>>& grid,
              const int remaining_chests,
              const int curr_empty_row,
              vector<bool>& col_occupation) {
    const unsigned int size = grid[0].size();
    if (remaining_chests == 0) { return 1; }
    if (curr_empty_row >= size) { return 0; }
    // clog << "curr_empty_row: " << curr_empty_row << endl;
    // log_array(col_occupation, "col_occupation");
    long long ans = 0;
    for (int col = 0; col < size; col++) { // 这行放
        if (!grid[curr_empty_row][col]) { continue; }
        if (col_occupation[col]) { continue; }
        // vector<bool> new_col_occupation(col_occupation);
        col_occupation[col] = true;
        ans += dfs(grid, remaining_chests - 1, curr_empty_row + 1, col_occupation);
        col_occupation[col] = false;
    }
    ans += dfs(grid, remaining_chests, curr_empty_row + 1, col_occupation); // 不在这行放
    return ans;
}

long long dfs(const vector<vector<bool>>& grid,
              const int remaining_chests,
              const int curr_empty_row = 0) {
    vector<bool> col_occupation(grid[0].size(), false);
    return dfs(grid, remaining_chests, curr_empty_row, col_occupation);
}

int main() {
    ios::sync_with_stdio(false);
    cin.tie(nullptr);

    int size, chest_count;
    while (cin >> size >> chest_count) {
        if (size < 0) { break; }
        vector<vector<bool>> grid = get_grid(size);
        cout << dfs(grid, chest_count) << endl;
    }
    // cin >> size;
    // chest_count = size;
    // const vector<vector<bool>> grid = get_grid(size);
    // cout << dfs(grid, chest_count) << endl;

    return 0;
}