/**
 * 
 */

// #include {{{
#include <algorithm>
#include <array>
#include <bitset>
#include <cassert>
#include <cfloat>
#include <cmath>
#include <cstdint>
#include <cstdio>
#include <cstdlib>
#include <cstring>
#include <ctime>
#include <deque>
#include <forward_list>
#include <functional>
#include <iomanip>
#include <iostream>
#include <fstream>
#include <sstream>
#include <iterator>
#include <limits>
#include <list>
#include <map>
#include <numeric>
#include <queue>
#include <random>
#include <regex>
#include <set>
#include <stack>
#include <string>
#include <tuple>
#include <type_traits>
#include <unordered_map>
#include <unordered_set>
#include <utility>
#include <vector>

#ifdef DEBUG
#include <fmt/format.h>
#include <fmt/ostream.h>
#endif

using namespace std;
// }}}

// type {{{
using  s8 =   int8_t;
using  u8 =  uint8_t;
using s16 =  int16_t;
using u16 = uint16_t;
using s32 =  int32_t;
using u32 = uint32_t;
using s64 =  int64_t;
using u64 = uint64_t;

template<typename T>
using max_heap = priority_queue<T, vector<T>, less<T>>;
template<typename T>
using min_heap = priority_queue<T, vector<T>, greater<T>>;
// }}}

// hide {{{
#ifdef __clang__
#pragma clang diagnostic push
#pragma clang diagnostic ignored "-Wunused-const-variable"
#endif
// }}}

// 適宜調整
//#define int s64
//#define double long double

constexpr bool AUTOFLUSH = false;

constexpr bool STDIO_ENABLE = false;

constexpr int IOS_PREC = 10;

constexpr int INF_S32 =             1'010'000'000;
constexpr s64 INF_S64 = 1'010'000'000'000'000'000LL;

constexpr auto   INF = INF_S64;
constexpr double EPS = 1e-9;

constexpr s64 MOD = 1'000'000'007;

// hide {{{
#ifdef __clang__
#pragma clang diagnostic pop
#endif
// }}}

// util {{{
template<typename T, size_t N, size_t... NS>
struct ArrayStruct {
    using type = array<typename ArrayStruct<T,NS...>::type,N>;
};

template<typename T, size_t N>
struct ArrayStruct<T,N> {
    using type = array<T,N>;
};

template<typename T, size_t N, size_t... NS>
using Array = typename ArrayStruct<T,N,NS...>::type;

template<typename T>
constexpr bool is_odd(T x)
{
    return x % 2 != 0;
}

template<typename T>
constexpr bool is_even(T x)
{
    return x % 2 == 0;
}

template<typename T>
constexpr int cmp(T x, T y)
{
    return (x > y) - (x < y);
}

template<typename T>
constexpr int sgn(T x)
{
    return cmp(x, T(0));
}

template<typename T>
constexpr T ipow(T a, T b)
{
    assert(b >= 0);
    T res(1);
    for(T i = 0; i < b; ++i)
        res *= a;
    return res;
}

template<
    typename T,
    std::enable_if_t<
        std::is_integral<T>::value &&
        std::is_signed<T>::value, std::nullptr_t> = nullptr>
constexpr T div_ceil(T a, T b)
{
    return a/b + (((a<0)^(b>0)) && (a%b));
}

template<
    typename T,
    std::enable_if_t<
        std::is_integral<T>::value &&
        std::is_unsigned<T>::value, std::nullptr_t> = nullptr>
constexpr T div_ceil(T a, T b)
{
    return a/b + !!(a%b);
}

template<
    typename T,
    std::enable_if_t<
        std::is_integral<T>::value &&
        std::is_signed<T>::value, std::nullptr_t> = nullptr>
constexpr T div_floor(T a, T b)
{
    return a/b - (((a>0)^(b>0)) && (a%b));
}

template<
    typename T,
    std::enable_if_t<
        std::is_integral<T>::value &&
        std::is_unsigned<T>::value, std::nullptr_t> = nullptr>
constexpr T div_floor(T a, T b)
{
    return a/b;
}

template<typename T>
constexpr typename enable_if<is_signed<T>::value,T>::type modulo(T a, T b)
{
    assert(b > 0);
    T r = a % b;
    return r >= 0 ? r : r+b;
}

template<typename T>
constexpr T clamp(T x, T lo, T hi)
{
    assert(lo <= hi);
    if(x < lo)
        return lo;
    else if(x > hi)
        return hi;
    else
        return x;
}

int sqrti(int x)
{
    assert(x >= 0);
    return static_cast<int>(sqrt(x));
}

s64 sqrtl(s64 x)
{
    assert(x >= 0);
    return static_cast<s64>(sqrt(x));
}

template<typename T>
bool chmax(T& xmax, const T& x)
{
    if(x > xmax) {
        xmax = x;
        return true;
    }
    else {
        return false;
    }
}

template<typename T>
bool chmin(T& xmin, const T& x)
{
    if(x < xmin) {
        xmin = x;
        return true;
    }
    else {
        return false;
    }
}

template<typename T>
constexpr int SIZE(const T& c)
{
    return static_cast<int>(c.size());
}

template<typename T, size_t N>
constexpr int SIZE(const T (&)[N])
{
    return static_cast<int>(N);
}

template<typename InputIt, typename T>
int argfind(InputIt first, InputIt last, const T& x)
{
    auto it = find(first, last, x);
    return distance(first, it);
}

template<typename InputIt>
int argmax(InputIt first, InputIt last)
{
    auto it = max_element(first, last);
    return distance(first, it);
}

template<typename InputIt>
int argmin(InputIt first, InputIt last)
{
    auto it = min_element(first, last);
    return distance(first, it);
}

template<typename InputIt>
bool alltrue(InputIt first, InputIt last)
{
    return all_of(first, last, [](bool b) { return b; });
}

template<typename InputIt>
bool anytrue(InputIt first, InputIt last)
{
    return any_of(first, last, [](bool b) { return b; });
}

template<typename InputIt>
bool allfalse(InputIt first, InputIt last)
{
    return !anytrue(first, last);
}

template<typename InputIt>
bool anyfalse(InputIt first, InputIt last)
{
    return !alltrue(first, last);
}

template<typename T>
array<pair<T,T>,4> neighbor4(const T& x, const T& y)
{
    return array<pair<T,T>,4> {{
                    { x, y-1 },
        { x-1, y },             { x+1, y },
                    { x, y+1 },
    }};
}

template<typename T>
array<pair<T,T>,8> neighbor8(const T& x, const T& y)
{
    return array<pair<T,T>,8> {{
        { x-1, y-1 }, { x, y-1 }, { x+1, y-1 },
        { x-1, y   },             { x+1, y   },
        { x-1, y+1 }, { x, y+1 }, { x+1, y+1 },
    }};
}

template<typename T>
bool in_bounds(const T& x, const T& minx, const T& maxx)
{
    return !(x < minx) && !(maxx < x);
}

template<typename T>
bool in_bounds_2(
    const T& x,    const T& y,
    const T& minx, const T& miny,
    const T& maxx, const T& maxy)
{
    return in_bounds(x, minx, maxx) && in_bounds(y, miny, maxy);
}

template<typename T>
bool in_bounds_wh(const T& x, const T& y, const T& w, const T& h)
{
    return in_bounds_2(x, y, 0, 0, w-1, h-1);
}

struct pairhash {
    template<typename T1, typename T2>
    size_t operator()(const pair<T1,T2>& p) const
    {
        size_t ans = 17;
        ans = 31*ans + hash<T1>()(p.first);
        ans = 31*ans + hash<T2>()(p.second);
        return ans;
    }
};

template<typename K, typename V>
pair<typename map<K,V>::iterator, bool> insert_or_assign(map<K,V>& m, const K& k, const V& v)
{
    auto it = m.lower_bound(k);
    if(it != end(m) && !m.key_comp()(k,it->first)) {
        it->second = v;
        return make_pair(it, false);
    }
    else {
        auto it_ins = m.insert(it, make_pair(k,v));
        return make_pair(it_ins, true);
    }
}

template<typename K, typename V>
pair<typename unordered_map<K,V>::iterator, bool>
insert_or_assign(unordered_map<K,V>& m, const K& k, const V& v)
{
    auto it = m.find(k);
    if(it != end(m)) {
        it->second = v;
        return make_pair(it, false);
    }
    else {
        auto it_ins = m.insert(it, make_pair(k,v));
        return make_pair(it_ins, true);
    }
}

template<typename T>
string TO_STRING(const T& x)
{
    ostringstream out;
    out << x;
    return out.str();
}

template<typename InputIt>
string JOIN(InputIt first, InputIt last, const string& sep)
{
    ostringstream out;
    while(first != last) {
        out << *first++;
        if(first != last)
            out << sep;
    }
    return out.str();
}

template<typename InputIt>
auto SUM(InputIt first, InputIt last)
{
    using T = typename iterator_traits<InputIt>::value_type;
    return accumulate(first, last, T());
}

template<typename T>
void UNIQ(T& c)
{
    c.erase(unique(begin(c), end(c)), end(c));
}

template<typename T, typename F>
enable_if_t<rank<T>::value==0> ARRAY_FOREACH(T& e, F f)
{
    f(e);
}

template<typename Array, typename F>
enable_if_t<rank<Array>::value!=0> ARRAY_FOREACH(Array& ary, F f)
{
    for(auto& e : ary)
        ARRAY_FOREACH(e, f);
}

template<typename Array, typename U>
enable_if_t<rank<Array>::value!=0> ARRAY_FILL(Array& ary, const U& v)
{
    ARRAY_FOREACH(ary, [&v](auto& elem) { elem = v; });
}

template<typename T, typename C>
T POP(stack<T,C>& stk)
{
    T x = stk.top(); stk.pop();
    return x;
}

template<typename T, typename C>
T POP(queue<T,C>& que)
{
    T x = que.front(); que.pop();
    return x;
}

template<typename T, typename Cont, typename Cmp>
T POP(priority_queue<T,Cont,Cmp>& que)
{
    T x = que.top(); que.pop();
    return x;
}

template<typename T>
void RD(T& x)
{
    cin >> x;
#ifdef DEBUG
    if(!cin) assert(false);
#endif
}

// 出力 {{{
// FPRINTSEQ {{{
template<typename InputIt>
ostream& FPRINTSEQ(ostream& out, InputIt first, InputIt last)
{
    for(InputIt it = first; it != last; ++it) {
        if(it != first) out << ' ';
        out << *it;
    }
    return out;
}
template<typename InputIt>
ostream& PRINTSEQ(InputIt first, InputIt last)
{
    return FPRINTSEQ(cout, first, last);
}
template<typename InputIt>
ostream& DPRINTSEQ(InputIt first, InputIt last)
{
    return FPRINTSEQ(cerr, first, last);
}
// }}}

// 1次元生配列 {{{
template<typename T, size_t N>
ostream& FPRINTARRAY1(ostream& out, const T (&c)[N])
{
    return FPRINTSEQ(out, cbegin(c), cend(c));
}
template<typename T, size_t N>
ostream& PRINTARRAY1(const T (&c)[N])
{
    return FPRINTARRAY1(cout, c);
}
template<typename T, size_t N>
ostream& DPRINTARRAY1(const T (&c)[N])
{
    return FPRINTARRAY1(cerr, c);
}
// }}}

// 2次元生配列 {{{
template<typename T, size_t N1, size_t N2>
ostream& FPRINTARRAY2(ostream& out, const T (&c)[N1][N2])
{
    out << '\n';
    for(const auto& e : c) {
        FPRINTARRAY1(out, e) << '\n';
    }
    return out;
}
template<typename T, size_t N1, size_t N2>
ostream& PRINTARRAY2(const T (&c)[N1][N2])
{
    return FPRINTARRAY2(cout, c);
}
template<typename T, size_t N1, size_t N2>
ostream& DPRINTARRAY2(const T (&c)[N1][N2])
{
    return FPRINTARRAY2(cerr, c);
}
// }}}

// 非mapコンテナ {{{
template<typename T>
ostream& operator<<(ostream& out, const vector<T>& c)
{
    return FPRINTSEQ(out, cbegin(c), cend(c));
}

// 特別扱い
template<typename T>
ostream& operator<<(ostream& out, const vector<vector<T>>& c)
{
    out << '\n';
    for(const auto& e : c) {
        out << e << '\n';
    }
    return out;
}

// 特別扱い
ostream& operator<<(ostream& out, const vector<string>& c)
{
    out << '\n';
    for(const string& e : c) {
        out << e << '\n';
    }
    return out;
}

template<typename T>
ostream& operator<<(ostream& out, const deque<T>& c)
{
    return FPRINTSEQ(out, cbegin(c), cend(c));
}

template<typename T>
ostream& operator<<(ostream& out, const list<T>& c)
{
    return FPRINTSEQ(out, cbegin(c), cend(c));
}

template<typename T>
ostream& operator<<(ostream& out, const forward_list<T>& c)
{
    return FPRINTSEQ(out, cbegin(c), cend(c));
}

template<typename T>
ostream& operator<<(ostream& out, const set<T>& c)
{
    return FPRINTSEQ(out, cbegin(c), cend(c));
}

template<typename T>
ostream& operator<<(ostream& out, const unordered_set<T>& c)
{
    return out << set<T>(cbegin(c), cend(c));
}

template<typename T>
ostream& operator<<(ostream& out, const multiset<T>& c)
{
    return FPRINTSEQ(out, cbegin(c), cend(c));
}

template<typename T>
ostream& operator<<(ostream& out, const unordered_multiset<T>& c)
{
    return out << multiset<T>(cbegin(c), cend(c));
}

template<typename T, size_t N>
ostream& operator<<(ostream& out, const array<T,N>& c)
{
    return FPRINTSEQ(out, cbegin(c), cend(c));
}
// }}}

// mapコンテナ {{{
template<typename InputIt>
ostream& FPRINTMAP(ostream& out, InputIt first, InputIt last)
{
    out << "{\n";
    for(auto it = first; it != last; ++it) {
        out << "  " << it->first << " : " << it->second << '\n';
    }
    out << "}\n";
    return out;
}
template<typename InputIt>
ostream& PRINTMAP(InputIt first, InputIt last)
{
    return FPRINTMAP(cout, first, last);
}
template<typename InputIt>
ostream& DPRINTMAP(InputIt first, InputIt last)
{
    return FPRINTMAP(cerr, first, last);
}

template<typename K, typename V>
ostream& operator<<(ostream& out, const map<K,V>& c)
{
    return FPRINTMAP(out, cbegin(c), cend(c));
}

template<typename K, typename V>
ostream& operator<<(ostream& out, const unordered_map<K,V>& c)
{
    return out << map<K,V>(cbegin(c), cend(c));
}

template<typename K, typename V>
ostream& operator<<(ostream& out, const multimap<K,V>& c)
{
    return FPRINTMAP(out, cbegin(c), cend(c));
}

template<typename K, typename V>
ostream& operator<<(ostream& out, const unordered_multimap<K,V>& c)
{
    return out << multimap<K,V>(cbegin(c), cend(c));
}
// }}}

// stack/queue/priority_queue {{{
template<typename T, typename C>
ostream& operator<<(ostream& out, stack<T,C> c)
{
    while(!c.empty()) {
        out << c.top();
        c.pop();
        if(!c.empty()) out << ' ';
    }
    return out;
}

template<typename T, typename C>
ostream& operator<<(ostream& out, queue<T,C> c)
{
    while(!c.empty()) {
        out << c.front();
        c.pop();
        if(!c.empty()) out << ' ';
    }
    return out;
}

template<typename T, typename Cont, typename Cmp>
ostream& operator<<(ostream& out, priority_queue<T,Cont,Cmp> c)
{
    while(!c.empty()) {
        out << c.top();
        c.pop();
        if(!c.empty()) out << ' ';
    }
    return out;
}
// }}}

// pair/tuple {{{
template<typename T1, typename T2>
ostream& operator<<(ostream& out, const pair<T1,T2>& p)
{
    return out << '(' << p.first << ',' << p.second << ')';
}

template<typename Tuple, size_t Pos>
ostream& FPRINTTUPLE(ostream& out, const Tuple&)
{
    return out;
}

template<typename Tuple, size_t Pos, typename T, typename... TS>
ostream& FPRINTTUPLE(ostream& out, const Tuple& t)
{
    if(Pos != 0)
        out << ',';
    out << get<Pos>(t);
    return FPRINTTUPLE<Tuple,Pos+1,TS...>(out, t);
}

template<typename... TS>
ostream& operator<<(ostream& out, const tuple<TS...>& t)
{
    out << '(';
    FPRINTTUPLE<tuple<TS...>,0,TS...>(out, t);
    out << ')';
    return out;
}
// }}}

// PRINT {{{
ostream& FPRINT(ostream& out) { return out; }

template<typename T, typename... TS>
ostream& FPRINT(ostream& out, const T& x, const TS& ...args)
{
    out << x;
    if(sizeof...(args))
        out << ' ';
    return FPRINT(out, args...);
}

template<typename... TS>
ostream& FPRINTLN(ostream& out, const TS& ...args)
{
    FPRINT(out, args...);
    return out << '\n';
}

template<typename... TS>
ostream& PRINT(const TS& ...args)
{
    return FPRINT(cout, args...);
}

template<typename... TS>
ostream& PRINTLN(const TS& ...args)
{
    return FPRINTLN(cout, args...);
}

template<typename... TS>
ostream& DPRINT(const TS& ...args)
{
    return FPRINT(cerr, args...);
}

template<typename... TS>
ostream& DPRINTLN(const TS& ...args)
{
    return FPRINTLN(cerr, args...);
}
// }}}
// }}}

void FLUSH()
{
    if(STDIO_ENABLE)
        fflush(stdout);
    else
        cout.flush();
}

[[noreturn]] void EXIT()
{
#ifdef DEBUG
    fflush(stdout);
    fflush(stderr);
    cout.flush();
    cerr.flush();
#else
    FLUSH();
#endif
    //quick_exit(0); // does not work on codeforces
    _Exit(0);
}

struct IoInit {
    IoInit()
    {
#ifndef DEBUG
        cin.tie(nullptr);
        if(!STDIO_ENABLE)
            ios::sync_with_stdio(false);
#endif
        cout << fixed << setprecision(IOS_PREC);

        if(AUTOFLUSH) {
            if(STDIO_ENABLE)
                setvbuf(stdout, nullptr, _IONBF, 0);
            cout << unitbuf;
        }
    }
} IOINIT;

#define FOR(i, start, end) for(s64 i = (start); i < (end); ++i)
#define REP(i, n) FOR(i, 0, n)

#define ALL(f,c,...) (([&](decltype((c)) cc) { return (f)(begin(cc), end(cc), ## __VA_ARGS__); })(c))

#define GENERIC(f) ([](auto&&... args) -> decltype(auto) { return (f)(forward<decltype(args)>(args)...); })

#define MEMSET(a,v) memset((a), (v), sizeof(a))

#define DBG(x) DPRINTLN('L', __LINE__, ':', #x, ':', (x))
// }}}

/**
 * a^b (mod m)
 *
 * 事前条件:
 *   a >= 0 && b >= 0
 */
s64 pow_modulo(s64 a, s64 b, s64 m)
{
    s64 res = 1;

    for(; b > 0; b >>= 1) {
        if(b & 1) {
            res *= a;
            res %= m;
        }
        a *= a;
        a %= m;
    }

    return res;
}

/**
 * mod p での a の逆元
 */
s64 inv_modulo(s64 a, s64 p)
{
    return pow_modulo(a, p-2, p);
}

/**
 * mod p 上での演算をクラス化してみるテスト
 * p は素数とする
 */
template<s64 P>
class ModPT {
public:
    ModPT() : v_(0) {}
    ModPT(s64 v) : v_(v%P) {}

    ModPT& operator+=(const ModPT& rhs)
    {
        v_ += rhs.v_;
        v_ %= P;
        return *this;
    }
    ModPT& operator-=(const ModPT& rhs)
    {
        v_  = (v_+P) - rhs.v_;
        v_ %= P;
        return *this;
    }
    ModPT& operator*=(const ModPT& rhs)
    {
        v_ *= rhs.v_;
        v_ %= P;
        return *this;
    }

    ModPT inv() const
    {
        return ModPT(inv_modulo(v_, P));
    }

    ModPT pow(s64 x) const
    {
        return ModPT(pow_modulo(v_, x, P));
    }

    friend ostream& operator<<(ostream& out, const ModPT<P>& a)
    {
        return out << a.v_;
    }
private:
    s64 v_;
};

template<s64 P>
const ModPT<P> operator+(const ModPT<P>& lhs, const ModPT<P>& rhs) { return ModPT<P>(lhs) += rhs; }
template<s64 P>
const ModPT<P> operator+(const ModPT<P>& lhs, s64 rhs) { return ModPT<P>(lhs) += rhs; }
template<s64 P>
const ModPT<P> operator+(s64 lhs, const ModPT<P>& rhs) { return ModPT<P>(rhs) += lhs; }
template<s64 P>
const ModPT<P> operator-(const ModPT<P>& lhs, const ModPT<P>& rhs) { return ModPT<P>(lhs) -= rhs; }
template<s64 P>
const ModPT<P> operator-(const ModPT<P>& lhs, s64 rhs) { return ModPT<P>(lhs) -= rhs; }
template<s64 P>
const ModPT<P> operator-(s64 lhs, const ModPT<P>& rhs) { return ModPT<P>(rhs) -= lhs; }
template<s64 P>
const ModPT<P> operator*(const ModPT<P>& lhs, const ModPT<P>& rhs) { return ModPT<P>(lhs) *= rhs; }
template<s64 P>
const ModPT<P> operator*(const ModPT<P>& lhs, s64 rhs) { return ModPT<P>(lhs) *= rhs; }
template<s64 P>
const ModPT<P> operator*(s64 lhs, const ModPT<P>& rhs) { return ModPT<P>(rhs) *= lhs; }

using ModP = ModPT<MOD>;

s64 H;
s64 W;

s64 A;
s64 B;

ModP fac[200001];
ModP ifac[200001];

void make_fac()
{
    int n = SIZE(fac);
    fac[0]  = 1;
    ifac[0] = 1;
    FOR(i, 1, n) {
        fac[i]  = i * fac[i-1];
        ifac[i] = fac[i].inv();
    }
}

void solve()
{
    make_fac();

    ModP all = fac[H-1+W-1] * ifac[H-1] * ifac[W-1];

    ModP cmpl = 0;
    REP(i, B) {
        ModP a = 1;
        a *= fac[H-A-1+i] * ifac[i] * ifac[H-A-1];
        a *= fac[A-1+W-i-1] * ifac[W-i-1] * ifac[A-1];
        cmpl += a;
    }

#ifdef DEBUG
    DBG(all);
    DBG(cmpl);
#endif

    ModP ans = all - cmpl;

    PRINTLN(ans);
}

signed main(signed /*argc*/, char** /*argv*/)
{
    RD(H);
    RD(W);

    RD(A);
    RD(B);

#ifdef DEBUG
    
#endif

    solve();

    EXIT();
}


Measured memory_bytes: 3456