#include <bits/stdc++.h>

using namespace std;
using i64 = int_fast64_t;
using ui64 = uint_fast64_t;
using db = long double;
using pii = pair<int, int>;
using pli = pair<int_fast64_t, int>;
using pll = pair<int_fast64_t, int_fast64_t>;
using pdi = pair<double, int>;
template <class T> using vct = vector<T>;
template <class T> using heap = priority_queue<T>;
template <class T> using minheap = priority_queue<T, vector<T>, greater<T>>;
template <class T> constexpr T inf = numeric_limits<T>::max() / 2 - 1;
constexpr int dx[9] = {1, 0, -1, 0, 1, -1, -1, 1, 0};
constexpr int dy[9] = {0, 1, 0, -1, 1, 1, -1, -1, 0};
constexpr long double gold = 1.618033988;
constexpr long double eps = 1e-15;

#define mod 1000000007LL
#define stdout_precision 10
#define stderr_precision 2
#define each(i,v) for (auto i = begin(v); i != end(v); ++i)
#define reach(i,v) for (auto i = rbegin(v); i != rend(v); ++i)
#define urep(i,s,t) for (int i = (s); i <= (t); ++i)
#define drep(i,s,t) for (int i = (s); i >= (t); --i)
#define rep(i,n) urep(i, 0, (n)-1)
#define rep1(i,n) urep(i, 1, (n))
#define rrep(i,n) drep(i, (n)-1, 0)
#define all(v) begin(v), end(v)
#define rall(v) rbegin(v), rend(v)
#define fir first
#define sec second
#define fro front()
#define bac back()
#define u_map unordered_map
#define u_set unordered_set
#define l_bnd lower_bound
#define u_bnd upper_bound
#define rsz resize
#define ers erase
#define emp emplace
#define emf emplace_front
#define emb emplace_back
#define pof pop_front
#define pob pop_back
#define mkp make_pair
#define mkt make_tuple
#define popcnt __builtin_popcount

struct setupper {
    setupper() {
        ios::sync_with_stdio(false);
        std::cin.tie(nullptr);
        std::cout.tie(nullptr);
        std::cerr.tie(nullptr);
        std::cout << fixed << setprecision(stdout_precision);
        std::cerr << fixed << setprecision(stderr_precision);
#ifdef Local
        std::cerr << "\n---stderr---\n";
        auto print_atexit = []() {
            std::cerr << "Exec time : " << clock() / (double)CLOCKS_PER_SEC * 1000.0 << "ms\n";
            std::cerr << "------------\n";
        };
        atexit((void(*)())print_atexit);
#endif
    }
} setupper_;

namespace std {
    template <class T> void hash_combine(size_t &seed, T const &key) {
        seed ^= hash<T>()(key) + 0x9e3779b9 + (seed << 6) + (seed >> 2);
    }
    template <class T, class U> struct hash<pair<T,U>> {
        size_t operator()(pair<T,U> const &pr) const
        {
            size_t seed = 0;
            hash_combine(seed,pr.first);
            hash_combine(seed,pr.second);
            return seed;
        }
    };
    template <class Tup, size_t index = tuple_size<Tup>::value - 1> struct hashval_calc {
        static void apply(size_t& seed, Tup const& tup) {
            hashval_calc<Tup, index - 1>::apply(seed, tup);
            hash_combine(seed,get<index>(tup));
        }
    };
    template <class Tup> struct hashval_calc<Tup,0> {
        static void apply(size_t& seed, Tup const& tup) {
            hash_combine(seed,get<0>(tup));
        }
    };
    template <class ...T> struct hash<tuple<T...>> {
        size_t operator()(tuple<T...> const& tup) const
        {
            size_t seed = 0;
            hashval_calc<tuple<T...>>::apply(seed,tup);
            return seed;
        }
    };
}

template <class T, class U> ostream& operator << (ostream& s, pair<T,U> p) { return s << p.fir << " " << p.sec; }
template <class T> ostream& operator << (ostream& s, vct<T> v) { each(i,v) { if(i != begin(v)) s << " "; s << *i; } return s; }
#define dump(...) cerr << " [ " << __LINE__ << " : " << __FUNCTION__ << " ] " << #__VA_ARGS__ << " : ";\
dump_func(__VA_ARGS__)
template <class T> void dump_func(T x) { cerr << x << '\n'; }
template <class T,class ...Rest> void dump_func(T x, Rest ... rest) { cerr << x << ","; dump_func(rest...); }
template <class T = int> T read() { T x; return cin >> x, x; }
template <class T> void write(T x) { cout << x << '\n'; }
template <class T, class ...Rest> void write(T x, Rest ... rest) { cout << x << ' '; write(rest...); }
void writeln() {}
template <class T, class ...Rest> void writeln(T x, Rest ... rest) { cout << x << '\n'; writeln(rest...); }
#define esc(...) writeln(__VA_ARGS__), exit(0)

namespace updater {
    template <class T> static void add(T &x, const T &y) { x += y; }
    template <class T> static void ext_add(T &x, const T &y, size_t w) { x += y * w; }
    template <class T> static void mul(T &x, const T &y) { x *= y; }
    template <class T> static void ext_mul(T &x, const T &y, size_t w) { x *= (T)pow(y,w); }
    template <class T> static bool chmax(T &x, const T &y) { return x < y ? x = y,true : false; }
    template <class T> static bool chmin(T &x, const T &y) { return x > y ? x = y,true : false; }
};
using updater::chmax;
using updater::chmin;

template <class T> T minf(const T &x, const T &y) { return min(x,y); }
template <class T> T mixf(const T &x, const T &y) { return max(x,y); }
bool bit(i64 n, uint8_t e) { return (n >> e) & 1; }
i64 mask(i64 n, uint8_t e) { return n & ((1 << e) - 1); }
int ilog(uint64_t x, uint64_t b = 2) { return x ? 1 + ilog(x / b,b) : -1; }
template <class F> i64 binry(i64 ok, i64 ng, const F &fn) {
    while (abs(ok - ng) > 1) {
        i64 mid = (ok + ng) / 2;
        (fn(mid) ? ok : ng) = mid;
    }
    return ok;
}
template <class A, size_t N, class T> void init(A (&array)[N], const T &val) { fill((T*)array,(T*)(array + N),val); }
template <class T> T cmprs(T &v) {
    T tmp = v, ret = v;
    sort(all(tmp));
    tmp.erase(unique(all(tmp)), end(tmp));
    each(i,ret) *i = l_bnd(all(tmp),*i) - begin(tmp);
    return ret;
}

struct Modint {
    #ifndef mod
        #define mod 1000000007LL
    #endif

    int x;

    Modint() : x(0) {}
    Modint(uint_fast64_t y) : x(y >= 0 ? y % mod : (mod - (-y) % mod) % mod) {}

    Modint &operator+=(const Modint &p) {
        if((x += p.x) >= mod) x -= mod;
        return *this;
    }

    Modint &operator-=(const Modint &p) {
        if((x += mod - p.x) >= mod) x -= mod;
        return *this;
    }

    Modint &operator*=(const Modint &p) {
        x = (int) (1LL * x * p.x % mod);
        return *this;
    }

    Modint &operator/=(const Modint &p) {
        *this *= inverse(p);
        return *this;
    }

    Modint operator-() const { return Modint(-x); }

    Modint operator+(const Modint &p) const { return Modint(*this) += p; }

    Modint operator-(const Modint &p) const { return Modint(*this) -= p; }

    Modint operator*(const Modint &p) const { return Modint(*this) *= p; }

    Modint operator/(const Modint &p) const { return Modint(*this) /= p; }

    bool operator==(const Modint &p) const { return x == p.x; }

    bool operator!=(const Modint &p) const { return x != p.x; }

    bool operator>(const Modint &p) const { return x > p.x; }

    bool operator<(const Modint &p) const { return x <  p.x; }

    bool operator>=(const Modint &p) const { return x >= p.x; }

    bool operator<=(const Modint &p) const { return x <= p.x; }

    static Modint inverse(const Modint &p) {
        int a = p.x, b = mod, u = 1, v = 0, t;
        while(b > 0) {
            t = a / b;
            a -= t * b;
            swap(a, b);
            u -= t * v;
            swap(u, v);
        }
        return Modint(u);
    }

    static Modint pow(Modint p, uint_fast64_t e) {
        Modint ret(1);
        while(e) {
            if(e & 1) ret *= p;
            p *= p;
            e >>= 1;
        }
        return ret;
    }

    friend ostream &operator<<(ostream &s, const Modint &p) { return s << p.x; }

    friend istream &operator>>(istream &s, Modint &p) {
        uint_fast64_t x;
        p = Modint((s >> x,x));
        return s;
    }
};

namespace calcfn {
    constexpr static uint N = 1 << 18;
    #ifndef mod
        #define mod 1000000007LL
    #endif

    struct impl {
        uint_fast64_t fact_[N + 1],invfact_[N + 1],inv_[N + 1];
        constexpr impl() : fact_(),invfact_(),inv_() {
            fact_[0] = 1;
            for(int i = 1; i <= N; ++i) fact_[i] = fact_[i - 1] * i % mod;
            inv_[1] = 1;
            for(int i = 2; i <= N; ++i) inv_[i] = mod - inv_[mod % i] * (mod / i) % mod;
            invfact_[0] = 1;
            for(int i = 1; i <= N; ++i) invfact_[i] = invfact_[i - 1] * inv_[i] % mod;
        }
    };
    constexpr impl impl_exe;

    constexpr static uint_fast64_t fact(int x) {
        return x >= 0 ? impl_exe.fact_[x] : 0;
    }

    constexpr static uint_fast64_t invfact(int x) {
        return x >= 0 ? impl_exe.invfact_[x] : 0;
    }

    constexpr static int_fast64_t comb(int x, int y) {
        return fact(x) * invfact(y) % mod * invfact(x - y) % mod;
    }

    constexpr static uint_fast64_t perm(int x, int y) {
        return comb(x,y) * fact(y) % mod;
    }

    constexpr static int_fast64_t gcd(int_fast64_t a, int_fast64_t b) {
        if(!b) return a > 0 ? a : -a; return gcd(b, a % b);
    }

    constexpr static int_fast64_t lcm(int_fast64_t a, int_fast64_t b) {
        if(a | b) return a / gcd(a, b) * b; return 0;
    }

    constexpr static uint_fast64_t ext_gcd(uint_fast64_t a, uint_fast64_t b, int_fast64_t &x, int_fast64_t &y) {
        uint_fast64_t d = a;
        if (b) d = ext_gcd(b, a % b, y, x), y -= (a / b) * x;
        else x = 1, y = 0;
        return d;
    }

    constexpr static uint_fast64_t modinv(uint_fast64_t x) {
        int_fast64_t z = 0,y = 0;
        ext_gcd(x,mod,z,y);
        return (z + mod) % mod;
    }

    constexpr uint_fast64_t modpow(int_fast64_t x, uint_fast64_t e) {
        if(!e) return 1;
        if(!(x %= mod)) return 0;
        return modpow(x * x % mod, e >> 1) * (e & 1 ? x : 1) % mod;
    }
}

int h,w,n;
pii wall[1<<12];
Modint dp[1<<12];

signed main() {
    cin>>h>>w>>n;
    rep(i,n) {
        cin>>wall[i].fir>>wall[i].sec;
        wall[i].fir--,wall[i].sec--;
    }
    wall[n]={0,0};
    wall[n+1]={h-1,w-1};
    sort(wall,wall+n+2);
    dp[0]=1;
    for(int i=1; i<=n+1; ++i) {
        dp[i]=calcfn::comb(wall[i].fir+wall[i].sec,wall[i].fir);
        for(int j=1; j<i; ++j) {
            dp[i]-=dp[j]*calcfn::comb(wall[i].fir-wall[j].fir+wall[i].sec-wall[j].sec,wall[i].fir-wall[j].fir);
        }
    }
    writeln(dp[n+1]);
}


Measured memory_bytes: 256