#include<bits/stdc++.h>
using namespace std;

#define rep(i,n) for(int i=0;i<(n);++i)
#define reps(i,n) for(int i=1;i<=(n);++i)
#define repr(i,n) for(int i=(n);i>=0;--i)
#define cinv(n,v) VL v(n);rep(i,n)cin>>v[i]
#define int long long
#define itn int
#define pb push_back
#define eb emplace_back
#define m_p make_pair
#define m_t make_tuple
#define p_p(a,b) pb(m_p(a,b))
#define all(a) a.begin(),a.end()
#define SORT(a) sort(all(a))
#define RSORT(a) sort(all(a),greater<>())
#define UNIQUE(a) a.erase(unique(all(a)),a.end())
#define SZ(a) (signed)(a.size())
#define debg(a) cout<<#a<<" "<<a<<endl;
#define debgp(a) cout<<#a<<" "<<a.fi<<" : "<<a.se<<endl
#define call(a) for(auto i:a)cout<<i<<" ";cout<<endl
#define callp(a) for(auto [k,v]:a)cout<<k<<":"<<v<<endl
#define show(a) for(cont &y:a){for(cont &x:y){cout<<x<<" ";}cout<<endl;}
#define out(a) cout<<(a)<<endl
#define ENDL cout<<endl
#define YES cout<<"YES"<<endl
#define NO cout<<"NO"<<endl
#define Yes cout<<"Yes"<<endl
#define No cout<<"No"<<endl
#define LINE puts("------------------")
#define fi first
#define se second
#define V vector
#define P pair
#define T tuple
#define PQ priority_queue
#define cont const auto
#define VV(type,name,y,x,a) vector<vector<type>> name = vector<vector<type>>(y,vector<type>(x,a))
typedef long long ll;
typedef double D;
typedef long double LD;
typedef string str;
typedef vector<ll> VL;
typedef pair<ll,ll> PL;
typedef vector<pair<ll,ll>> VP;
typedef tuple<ll,ll,ll> T3;
typedef tuple<ll,ll,ll,ll> T4;
typedef struct{ll to;ll cost;} Graphs;
typedef V<V<Graphs>> AdjList;
const signed INF = (1LL<<30);
const long long MOD = (1e9+7);
const long long LINF = (1LL<<60);
const long long LMAX = LLONG_MAX;
void YN(bool b){cout<<(b?"Yes":"No")<<endl;}

template<class T>inline T gcd(T a,T b){if(b==0)return a; return(gcd(b,a%b));}
template<class T>inline T lcm(T a,T b){return a/gcd(a,b)*b;}
template<class T>inline bool chmax(T &a,const T &b){if(a<b){a=b;return true;}return false;}
template<class T>inline bool chmin(T &a,const T &b){if(a>b){a=b;return true;}return false;}
template<class T>T center(T a,T b,T c){
  if( (a<=b&&b<=c)||(a>=b&&b>=c) )return b;
  if( (b>=a&&a>=c)||(b<=a&&a<=c) )return a;
  return c;
}
void print(){}
template<class Head,class... Tail>
void print(Head&& head, Tail&&... tail){
  cout<<head<<endl;
  print(forward<Tail>(tail)...);
}
void input(){}
template<class Head,class... Tail>
void input(Head&& head, Tail&&... tail){
  cin>>head;
  input(forward<Tail>(tail)...);
}
template<typename T>
ostream &operator<<(ostream&out,const vector<T>&v){
  if(!v.empty()){
    copy(v.begin(),v.end(),ostream_iterator<T>(out,", "));
    out<<"\b\b";
  }
  return out;
}
template<typename T1, typename T2>
ostream &operator<<(ostream&out,const pair<T1,T2>&p){
  out<<p.first<<", "<<p.second;
  return out;
}

const ll _MAX = (ll)1e6+10;
vector<ll> fac(_MAX),finv(_MAX),inv(_MAX);
// 前処理
void comb_init(){
  fac[0]=fac[1]=1;
  finv[0]=finv[1]=1;
  inv[1]=1;
  for(int i=2;i<_MAX;++i){
    fac[i]=fac[i-1]*i%MOD;
    inv[i]=MOD-inv[MOD%i]*(MOD/i)%MOD;
    finv[i]=finv[i-1]*inv[i]%MOD;
  }
}
// 二項係数計算
ll comb(ll n,ll k){
  if(n<k)return 0;
  if(n<0||k<0)return 0;
  return fac[n]*(finv[k]*finv[n-k]%MOD)%MOD;
}

signed main(){
  cin.tie(0);
  ios::sync_with_stdio(false);
  cout<<fixed<<setprecision(10);
  
  comb_init();
  ll h,w,a,b;
  input(h,w,a,b);
  ll ans=0;
  for(ll i=b;i<w;++i){
    ll res=1;
    res*=comb(h-a-1+i,h-a-1);
    res*=comb(a+w-i-2,a-1);
    ans+=res;
    if(ans>(1LL<<40))ans%=MOD;
  }
  ans%=MOD;
  out(ans);


  return 0;
}


Measured memory_bytes: 23680