//#pragma comment(linker, "/stack:200000000")
//#pragma GCC optimize("Ofast")
//#pragma GCC optimize(3)
//#pragma GCC target("sse,sse2,sse3,ssse3,sse4,popcnt,abm,mmx,avx,tune=native")
//#pragma GCC target("sse3","sse2","sse")
//#pragma GCC target("avx","sse4","sse4.1","sse4.2","ssse3")
//#pragma GCC target("f16c")
//#pragma GCC optimize("inline","fast-math","unroll-loops","no-stack-protector")
//#pragma GCC diagnostic error "-fwhole-program"
//#pragma GCC diagnostic error "-fcse-skip-blocks"
//#pragma GCC diagnostic error "-funsafe-loop-optimizations"
//#pragma GCC diagnostic error "-std=c++14"
#include "bits/stdc++.h"
//#include "ext/pb_ds/tree_policy.hpp"
//#include "ext/pb_ds/assoc_container.hpp"
#define PB push_back
#define PF push_front
#define LB lower_bound
#define UB upper_bound
#define fr(x) freopen(x,"r",stdin)
#define fw(x) freopen(x,"w",stdout)
#define iout(x) printf("%d\n",x)
#define lout(x) printf("%lld\n",x)
#define REP(x,l,u) for(ll x = l;x<u;x++)
#define RREP(x,l,u) for(ll x = l;x>=u;x--)
#define complete_unique(a) a.erase(unique(a.begin(),a.end()),a.end())
#define mst(x,a) memset(x,a,sizeof(x))
#define all(a) a.begin(),a.end()
#define PII pair<int,int>
#define PLL pair<ll,ll>
#define MP make_pair
#define sqr(x) ((x)*(x))
#define lowbit(x) ((x)&(-(x)))
#define lson (ind<<1)
#define rson (ind<<1|1)
#define se second
#define fi first
#define sz(x) ((int)x.size())
#define EX0 exit(0);

typedef  long long ll;
typedef unsigned long long ull;
typedef double db;
typedef long double ld;
using namespace std;
typedef vector<ll> VLL;
typedef vector<int> VI;
const int block_size = 320;
typedef complex<ll> point;
const ll mod = 1e9+7;
const ll inf = 1e9+7;
const ld eps = 1e-9;
const db PI = atan(1)*4;
template<typename T>
inline int sign(const T&a) {
    if(a<0)return -1;
    if(a>0)return 1;
    return 0;
}
string to_string(string s) {
    return '"' + s + '"';
}

string to_string(const char* s) {
    return to_string((string) s);
}

string to_string(bool b) {
    return (b ? "true" : "false");
}

template <typename A, typename B>
string to_string(pair<A, B> p) {
    return "(" + to_string(p.first) + ", " + to_string(p.second) + ")";
}

template <typename A>
string to_string(A v) {
    bool first = true;
    string res = "{";
    for (const auto &x : v) {
        if (!first) {
            res += ", ";
        }
        first = false;
        res += to_string(x);
    }
    res += "}";
    return res;
}

void debug_out() { cerr << endl; }

template <typename Head, typename... Tail>
void debug_out(Head H, Tail... T) {
    cerr << " " << to_string(H);
    debug_out(T...);
}

#ifndef ONLINE_JUDGE
#define dbg(...) cerr << "[" << #__VA_ARGS__ << "]:", debug_out(__VA_ARGS__)
#else
#define dbg(...) {}
#endif

template<typename T,typename S>inline bool upmin(T&a,const S&b){return a>b?a=b,1:0;}
template<typename T,typename S>inline bool upmax(T&a,const S&b){return a<b?a=b,1:0;}

template<typename T> inline void in(T &x) {
    x = 0;
    T f = 1;
    char ch = getchar();
    while (!isdigit(ch)) {
        if (ch == '-') f = -1;
        ch = getchar();
    }
    while (isdigit(ch))  {
        x = x * 10 + ch - '0';
        ch = getchar();
    }
    x *= f;
}

ll twop(int x) {
    return 1LL<<x;
}

// m must be positive
template<typename T>
T MOD(T a, T m){
    a %= m;
    if (a < 0)
        a += m;
    return a;
}

// a must be relatively prime to m
template<typename T>
T inverse(T a, T m){
    a = MOD(a, m);
    if (a <= 1)
        return a;
    return MOD((1 - inverse(m, a) * m) / a, m);
}

template<typename A,typename B > inline void in(A&x,B&y) {
    in(x);
    in(y);
}
template<typename A,typename B,typename C>inline void in(A&x,B&y,C&z) {
    in(x);
    in(y);
    in(z);
}
template<typename A,typename B,typename C,typename D> inline void in(A&x,B&y,C&z,D&d) {
    in(x);
    in(y);
    in(z);
    in(d);
}
ll gcd(ll a,ll b){return b==0?a:gcd(b,a%b);}
namespace SOLVE {
    ll h,w,n;
    const ll maxn = 200010;
    ll fac[maxn],facinv[maxn],inv[maxn];
    void init(){
        fac[0] = 1;
        REP(i,1,maxn)fac[i] = i*(fac[i-1])%mod;
        facinv[maxn-1]=inverse(fac[maxn-1], mod);
        RREP(i,maxn-2,0){
            facinv[i] = facinv[i+1]*(i+1)%mod;
        }
        inv[1]=1;
        for(int i=2;i<maxn;i++)
            inv[i]=(mod-(ll)mod/i*inv[mod%i]%mod);
    }
    
    ll combi(int n,int m){
        if(n<0 || m<0 || n<m)return 0;
        return fac[n]*facinv[m]%mod*facinv[n-m]%mod;
    }
    
    ll cnt(ll h,ll w){
        if(h<0 or w<0)return 0;
//        dbg(h,w);
        return combi(h+w, w);
    }

    vector<PLL>v;
    ll dp[3010][2];
    void main(){
        init();
        in(h,w,n);
//        assert(n>=10);
        REP(i,0,n){
            ll a,b;in(a,b);
            a--; b--;
            v.PB(MP(a,b));
        }
        sort(all(v));
        h--;w--;
        ll ans = cnt(h, w);
//        REP(mask,1,twop(n)){
//            vector<PLL> nodes;
//            REP(j,0,n)if(twop(j)&mask)nodes.PB(v[j]);
//            dbg(nodes);
//            ll tmp = cnt(nodes[0].fi, nodes[0].se) * cnt(h-nodes.back().fi, w-nodes.back().se);
//            REP(j,0,sz(nodes)-1){
//                tmp *= cnt(nodes[j+1].fi-nodes[j].fi, nodes[j+1].se-nodes[j].se);
//                tmp %= mod;
//            }
//            if(sz(nodes)%2 == 1)ans -= tmp;
//            else ans += tmp;
//        }
//        cout<<MOD(ans,mod)<<endl;
//        return;
//
        
        
        
        REP(i,0,n){
            (dp[i][1] += cnt(v[i].fi, v[i].se))%=mod;
            REP(j,0,i){
                if(v[j].fi<=v[i].fi and v[j].se<=v[i].se){
                    (dp[i][0] += dp[j][1] * cnt(v[i].fi-v[j].fi, v[i].se-v[j].se))%=mod;
                    (dp[i][1] += dp[j][0] * cnt(v[i].fi-v[j].fi, v[i].se-v[j].se))%=mod;
                }
            }
        //    dbg(v[i],dp[i][0],dp[i][1]);
        }
//        dbg(ans);
        REP(j,0,n){
            ans -= dp[j][1] * cnt(h-v[j].fi, w-v[j].se) % mod;
//            dbg(ans);
            ans += dp[j][0] * cnt(h-v[j].fi, w-v[j].se) % mod;
//            dbg(ans);

        }
        cout<<MOD(ans,mod)<<endl;
        
        
        
        
        
        
        
        
        
        
    }
}


signed main() {
#ifndef ONLINE_JUDGE
#endif
    
    
    
    
    
    int t = 1;
//    in(t);
    while(t--){
        SOLVE::main();

    }
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    return 0;
}


Measured memory_bytes: 5120