#include <bits/stdc++.h>

#define rep(i, n) for (int i = 0; i < int(n); i++)
#define rrep(i, n) for (int i = int(n) - 1; i >= 0; i--)
#define reps(i, n) for (int i = 1; i <= int(n); i++)
#define rreps(i, n) for (int i = int(n); i >= 1; i--)
#define repc(i, n) for (int i = 0; i <= int(n); i++)
#define rrepc(i, n) for (int i = int(n); i >= 0; i--)
#define repi(i, a, b) for (int i = int(a); i < int(b); i++)
#define repic(i, a, b) for (int i = int(a); i <= int(b); i++)
#define all(a) (a).begin(), (a).end()
#define bit32(x) (1 << (x))
#define bit64(x) (1ll << (x))
#define sz(v) ((int) v.size())

using namespace std;

using i64 = long long;
using f80 = long double;
using vi32 = vector<int>;
using vi64 = vector<i64>;
using vf80 = vector<f80>;
using vstr = vector<string>;

void yes() { cout << "Yes" << endl; exit(0); }
void no() { cout << "No" << endl; exit(0); }
template <typename T> class pqasc : public priority_queue<T, vector<T>, greater<T>> {};
template <typename T> class pqdesc : public priority_queue<T, vector<T>, less<T>> {};
template <typename T> void amax(T &x, T y) { x = max(x, y); }
template <typename T> void amin(T &x, T y) { x = min(x, y); }
template <typename T> T exp(T x, i64 n, T e = 1) { T r = e; while (n > 0) { if (n & 1) r *= x; x *= x; n >>= 1; } return r; }
template <typename T> istream& operator>>(istream &is, vector<T> &v) { for (auto &x : v) is >> x; return is; }
template <typename T> ostream& operator<<(ostream &os, vector<T> &v) { rep(i, v.size()) { if (i) os << ' '; os << v[i]; } return os; }
void solve(); int main() { ios::sync_with_stdio(0); cin.tie(0); cout << fixed << setprecision(16); solve(); return 0; }

const int INF = 1001001001;
const int dx[] = {1, 0, -1, 0};
const int dy[] = {0, 1, 0, -1};

template <int mod>
struct ModInt {
  int x;
  ModInt(): x(0) {}
  ModInt(long long a) { x = a % mod; if (x < 0) x += mod; }
  ModInt &operator+=(ModInt that) { x = (x + that.x) % mod; return *this; }
  ModInt &operator-=(ModInt that) { x = (x + mod - that.x) % mod; return *this; }
  ModInt &operator*=(ModInt that) { x = (long long) x * that.x % mod; return *this; }
  ModInt &operator/=(ModInt that) { return *this *= that.inverse(); }
  ModInt inverse() {
    int a = x, b = mod, u = 1, v = 0;
    while (b) { int t = a / b; a -= t * b; u -= t * v; swap(a, b); swap(u, v); }
    return ModInt(u);
  }
  #define op(o, p) ModInt operator o(ModInt that) { return ModInt(*this) p that; }
    op(+, +=) op(-, -=) op(*, *=) op(/, /=)
  #undef op
  friend ostream& operator<<(ostream &os, ModInt m) { return os << m.x; }
};

using mint = ModInt<1000000007>;

template <typename T>
struct ModCalc {
  vector<T> facc;
  vector<T> finv;
  ModCalc(int max) {
    facc.resize(max + 1);
    finv.resize(max + 1);
    facc[0] = 1;
    for (int i = 0; i < max; i++) {
      facc[i + 1] = facc[i] * (i + 1);
    }
    finv[max] = (T) 1 / facc[max];
    for (int i = max; i > 0; i--) {
      finv[i - 1] = finv[i] * i;
    }
  }
  T com(int a, int b) {
    if (a < 0 || b < 0 || b > a) return 0;
    return facc[a] * finv[a - b] * finv[b];
  }
};

using mcalc = ModCalc<mint>;
auto mc = mcalc(200001);

mint dp[3030][2];

void solve() {
  int h, w, n;
  cin >> h >> w >> n;
  vi32 r(n), c(n);
  rep(i, n) {
    cin >> r[i] >> c[i];
  }
  r.push_back(1);
  c.push_back(1);
  r.push_back(h);
  c.push_back(w);
  vi32 o(n + 2);
  iota(all(o), 0);
  sort(all(o), [&](int i, int j) {
    if (c[i] != c[j]) return c[i] < c[j];
    return r[i] < r[j];
  });
  dp[0][0] = 1;
  rep(_i, n + 1) rep(k, 2) {
    int i = o[_i];
    repi(_j, _i + 1, n + 2) {
      int j = o[_j];
      if (r[i] > r[j] || c[i] > c[j]) continue;
      int nk = (k + 1) % 2;
      if (r[j] == h && c[j] == w) {
        nk = k;
      }
      int rdiff = r[j] - r[i];
      int cdiff = c[j] - c[i];
      dp[_j][nk] += dp[_i][k] * mc.com(rdiff + cdiff, rdiff);
    }
  }
  mint ans = dp[n+1][0] - dp[n+1][1];
  cout << ans << endl;
}


Measured memory_bytes: 1920