#include <bits/stdc++.h>
using namespace std;
typedef long long int ll;
typedef unsigned int uint;
typedef unsigned char uchar;
typedef unsigned long long ull;
typedef pair<int, int> pii;
typedef pair<ll, ll> pll;
typedef vector<int> vi;

#define REP(i,x) for(int i=0;i<(int)(x);i++)
#define REPS(i,x) for(int i=1;i<=(int)(x);i++)
#define RREP(i,x) for(int i=((int)(x)-1);i>=0;i--)
#define RREPS(i,x) for(int i=((int)(x));i>0;i--)
#define FOR(i,c) for(__typeof((c).begin())i=(c).begin();i!=(c).end();i++)
#define RFOR(i,c) for(__typeof((c).rbegin())i=(c).rbegin();i!=(c).rend();i++)
#define ALL(container) (container).begin(), (container).end()
#define RALL(container) (container).rbegin(), (container).rend()
#define SZ(container) ((int)container.size())
#define mp(a,b) make_pair(a, b)
#define pb push_back
#define eb emplace_back
#define UNIQUE(v) v.erase( unique(v.begin(), v.end()), v.end() );
#define __builtin_popcount __builtin_popcountll

template<class T> bool chmax(T &a, const T &b) { if (a<b) { a=b; return 1; } return 0; }
template<class T> bool chmin(T &a, const T &b) { if (a>b) { a=b; return 1; } return 0; }
template<class T> ostream& operator<<(ostream &os, const vector<T> &t) {
    os<<"["; FOR(it,t) {if(it!=t.begin()) os<<","; os<<*it;} os<<"]"; return os;
}
template<class T> ostream& operator<<(ostream &os, const set<T> &t) {
    os<<"{"; FOR(it,t) {if(it!=t.begin()) os<<","; os<<*it;} os<<"}"; return os;
}
template<class S, class T> ostream& operator<<(ostream &os, const map<S, T> &t) {
    os<<"{"; FOR(it,t) {if(it!=t.begin()) os<<","; os<<*it;} os<<"}"; return os;
}
template<class S, class T> ostream& operator<<(ostream &os, const pair<S,T> &t) { return os<<"("<<t.first<<","<<t.second<<")";}
template<class S, class T> pair<S,T> operator+(const pair<S,T> &s, const pair<S,T> &t){ return pair<S,T>(s.first+t.first, s.second+t.second);}
template<class S, class T> pair<S,T> operator-(const pair<S,T> &s, const pair<S,T> &t){ return pair<S,T>(s.first-t.first, s.second-t.second);}

const int INF = 1<<28;
const double EPS = 1e-8;
const int MOD = 1000000007;

template<int N, int MOD>
struct Comb{
    ll fact[N+1], inv[N+1];
    Comb(){
        fact[0] = inv[0] = inv[1] = 1;
        for(int i=2;i<=N;i++) inv[i] = (MOD+((ll)-inv[MOD%i]*(MOD/i))%MOD)%MOD;
        REPS(i, N){
            fact[i] = fact[i-1]*i%MOD;
            inv[i] = inv[i]*inv[i-1]%MOD;
        }
    }
    ll operator()(int n, int r){
        if(n < 0 || r < 0 || r > n) return 0;
        ll res = inv[r]*inv[n-r];
        if(res >= MOD) res%= MOD;
        res *= fact[n];
        if(res >= MOD) res%= MOD;
        return res;
    }
};
Comb<300000, MOD> C;

int T, h, w, n;

int solve(int h, int w, vector<pii> p) {
    p.emplace_back(0, 0);
    p.emplace_back(h - 1, w - 1);
    sort(ALL(p));
    int n = p.size();
    vector<pll> dp(n);
    dp[0] = pll(1, 0);
    REP(i, n) {
        REP(j, i) {
            if (p[j].first <= p[i].first && p[j].second <= p[i].second) {
                int y = p[i].second - p[j].second;
                int x = p[i].first - p[j].first;
                (dp[i].first += dp[j].second * C(x + y, x)) %= MOD;
                (dp[i].second += dp[j].first * C(x + y, x)) %= MOD;
            }
        }
    }
    return (dp[n - 1].second - dp[n - 1].first + MOD) % MOD;
}

int main(int argc, char *argv[]){
    ios::sync_with_stdio(false);
    while(cin >> h >> w >> n){
        vector<pii> p;
        REP(i, n) {
            int r, c;
            cin >> r >> c; r--; c--;
            p.emplace_back(r, c);
        }
        cout << solve(h, w, p) << endl;
    }
    return 0;
}


Measured memory_bytes: 5120