#include <cassert>
#include <cmath>
#include <cstdint>
#include <cstdio>
#include <cstdlib>
#include <cstring>
#include <algorithm>
#include <bitset>
#include <complex>
#include <deque>
#include <functional>
#include <iostream>
#include <limits>
#include <map>
#include <numeric>
#include <queue>
#include <random>
#include <set>
#include <sstream>
#include <string>
#include <unordered_map>
#include <unordered_set>
#include <utility>
#include <vector>

using namespace std;

using Int = long long;

template <class T1, class T2> ostream &operator<<(ostream &os, const pair<T1, T2> &a) { return os << "(" << a.first << ", " << a.second << ")"; };
template <class T> ostream &operator<<(ostream &os, const vector<T> &as) { const int sz = as.size(); os << "["; for (int i = 0; i < sz; ++i) { if (i >= 256) { os << ", ..."; break; } if (i > 0) { os << ", "; } os << as[i]; } return os << "]"; }
template <class T> void pv(T a, T b) { for (T i = a; i != b; ++i) cerr << *i << " "; cerr << endl; }
template <class T> bool chmin(T &t, const T &f) { if (t > f) { t = f; return true; } return false; }
template <class T> bool chmax(T &t, const T &f) { if (t < f) { t = f; return true; } return false; }
#define COLOR(s) ("\x1b[" s "m")

////////////////////////////////////////////////////////////////////////////////
template <unsigned M_> struct ModInt {
  static constexpr unsigned M = M_;
  unsigned x;
  constexpr ModInt() : x(0U) {}
  constexpr ModInt(unsigned x_) : x(x_ % M) {}
  constexpr ModInt(unsigned long long x_) : x(x_ % M) {}
  constexpr ModInt(int x_) : x(((x_ %= static_cast<int>(M)) < 0) ? (x_ + static_cast<int>(M)) : x_) {}
  constexpr ModInt(long long x_) : x(((x_ %= static_cast<long long>(M)) < 0) ? (x_ + static_cast<long long>(M)) : x_) {}
  ModInt &operator+=(const ModInt &a) { x = ((x += a.x) >= M) ? (x - M) : x; return *this; }
  ModInt &operator-=(const ModInt &a) { x = ((x -= a.x) >= M) ? (x + M) : x; return *this; }
  ModInt &operator*=(const ModInt &a) { x = (static_cast<unsigned long long>(x) * a.x) % M; return *this; }
  ModInt &operator/=(const ModInt &a) { return (*this *= a.inv()); }
  ModInt pow(long long e) const {
    if (e < 0) return inv().pow(-e);
    ModInt a = *this, b = 1U; for (; e; e >>= 1) { if (e & 1) b *= a; a *= a; } return b;
  }
  ModInt inv() const {
    unsigned a = M, b = x; int y = 0, z = 1;
    for (; b; ) { const unsigned q = a / b; const unsigned c = a - q * b; a = b; b = c; const int w = y - static_cast<int>(q) * z; y = z; z = w; }
    assert(a == 1U); return ModInt(y);
  }
  ModInt operator+() const { return *this; }
  ModInt operator-() const { ModInt a; a.x = x ? (M - x) : 0U; return a; }
  ModInt operator+(const ModInt &a) const { return (ModInt(*this) += a); }
  ModInt operator-(const ModInt &a) const { return (ModInt(*this) -= a); }
  ModInt operator*(const ModInt &a) const { return (ModInt(*this) *= a); }
  ModInt operator/(const ModInt &a) const { return (ModInt(*this) /= a); }
  template <class T> friend ModInt operator+(T a, const ModInt &b) { return (ModInt(a) += b); }
  template <class T> friend ModInt operator-(T a, const ModInt &b) { return (ModInt(a) -= b); }
  template <class T> friend ModInt operator*(T a, const ModInt &b) { return (ModInt(a) *= b); }
  template <class T> friend ModInt operator/(T a, const ModInt &b) { return (ModInt(a) /= b); }
  explicit operator bool() const { return x; }
  bool operator==(const ModInt &a) const { return (x == a.x); }
  bool operator!=(const ModInt &a) const { return (x != a.x); }
  friend std::ostream &operator<<(std::ostream &os, const ModInt &a) { return os << a.x; }
};
////////////////////////////////////////////////////////////////////////////////

constexpr unsigned MO = 1000000007;
using Mint = ModInt<MO>;


// det(a + x I)
// O(n^3)
//   Call by value: Modifies a (Watch out when using C-style array!)
template <class T> vector<T> charPoly(vector<vector<T>> a) {
  const int n = a.size();
  // upper Hessenberg
  for (int j = 0; j < n - 2; ++j) {
    for (int i = j + 1; i < n; ++i) {
      if (a[i][j]) {
        swap(a[j + 1], a[i]);
        for (int ii = 0; ii < n; ++ii) swap(a[ii][j + 1], a[ii][i]);
        break;
      }
    }
    if (a[j + 1][j]) {
      const T s = 1 / a[j + 1][j];
      for (int i = j + 2; i < n; ++i) {
        const T t = s * a[i][j];
        for (int jj = j; jj < n; ++jj) a[i][jj] -= t * a[j + 1][jj];
        for (int ii = 0; ii < n; ++ii) a[ii][j + 1] += t * a[ii][i];
      }
    }
  }
  // fss[i] := det(a[0..i][0..i] + x I_i)
  vector<vector<T>> fss(n + 1);
  fss[0] = {1};
  for (int i = 0; i < n; ++i) {
    fss[i + 1].assign(i + 2, 0);
    for (int k = 0; k <= i; ++k) fss[i + 1][k + 1] = fss[i][k];
    for (int k = 0; k <= i; ++k) fss[i + 1][k] += a[i][i] * fss[i][k];
    T prod = 1;
    for (int j = i - 1; j >= 0; --j) {
      prod *= -a[j + 1][j];
      const T t = prod * a[j][i];
      for (int k = 0; k <= j; ++k) fss[i + 1][k] += t * fss[j][k];
    }
  }
  return fss[n];
}


int N, M, T;
char G[80][80];
vector<int> S, V;

// B[i][u] := (A^i)[u][N-1]
Mint B[80][80];

int main() {
  for (; ~scanf("%d%d%d", &N, &M, &T); ) {
    for (int u = 0; u < N; ++u) {
      scanf("%s", G[u]);
    }
    S.resize(M);
    V.resize(M);
    for (int m = 0; m < M; ++m) {
      scanf("%d%d", &S[m], &V[m]);
      --V[m];
    }
    
    vector<vector<Mint>> A(N, vector<Mint>(N, 0));
    for (int u = 0; u < N; ++u) {
      const int deg = count(G[u], G[u] + N, '1');
      const Mint invDeg = Mint(deg).inv();
      for (int v = 0; v < N; ++v) if (G[u][v] == '1') A[u][v] = invDeg;
    }
    for (int i = 0; i <= N; ++i) {
      for (int u = 0; u < N; ++u) {
        B[i][u] = 0;
      }
    }
    for (int u = 0; u < N; ++u) {
      B[0][u] = (u == N-1) ? 1 : 0;
    }
    for (int i = 0; i < N; ++i) {
      for (int u = 0; u < N; ++u) for (int v = 0; v < N; ++v) {
        B[i + 1][u] += A[u][v] * B[i][v];
      }
    }
    
    auto F = charPoly(A);
    for (int i = N - 1; i >= 0; i -= 2) F[i] = -F[i];
// cerr<<"F = "<<F<<endl;
    
    unsigned key = 0;
    // (ans[t], ..., ans[t+N-1])
    vector<Mint> gs(N + 1, 0);
    for (int m = 0, t = 1; t <= T; ++t) {
      // advance
      for (int i = 0; i < N; ++i) gs[N] -= F[i] * gs[i];
      for (int i = 0; i < N; ++i) gs[i] = gs[i + 1];
      gs[N] = 0;
// cerr<<"t = "<<t<<": gs = "<<gs<<endl;
      // start
      for (; m < M && S[m] == t; ++m) {
        for (int i = 0; i < N; ++i) {
          gs[i] += B[i][V[m]];
        }
// cerr<<"m = "<<m<<": gs = "<<gs<<endl;
      }
      key ^= gs[0].x;
    }
    printf("%u\n", key);
  }
  return 0;
}