#include <iostream>
#include <cmath>
#include <vector>
#include <algorithm>
using namespace std;


template <int M, bool IsPrime = false>
class modulo {
    using ll = long long;
public:
    modulo() : n(0) {}
    modulo(int m) : n(m) {
        if(n >= M) {
            n %= M;
        } else if(n < 0) {
            n = (n % M + M) % M;
        }
    }
    modulo(ll m) {
        if(m >= M) {
            m %= M;
        } else if(m < 0) {
            m = (m % M + M) % M;
        }
        n = m;
    }

    explicit operator int() const {
        return n;
    }
    explicit operator ll() const {
        return n;
    }
    bool operator==(modulo const& a) const {
        return n == a.n;
    }

    modulo& operator+=(modulo const& a) {
        n += a.n;
        if(n >= M) {
            n -= M;
        }
        return *this;
    }
    modulo& operator-=(modulo const& a) {
        n -= a.n;
        if(n < 0) {
            n += M;
        }
        return *this;
    }
    modulo& operator*=(modulo const& a) {
        n = (ll(n) * a.n) % M;
        return *this;
    }
    modulo operator^(int n) const {
        if(n == 0) {
            return modulo(1);
        }
        const modulo a = *this;
        modulo res = (a * a) ^ (n / 2);
        return n % 2 ? res * a : res;
    }
   
    // for C++11, enable_if_t -> typename enable_if::type
    typename std::enable_if<IsPrime, modulo>::type operator/(modulo const& a) const {
        return *this * modulo(inv(ll(a), M));
    }


private:
    int n;
    // ax %% 1 (mod p)
    // ex: 5x %% 1 (mod 13)
    // テ」ツ?、テ」ツ?セテ」ツつ?5x + 13y = 1
    // テ、ツクツ。ティツセツコmod5テ」ツつ津・ツ渉姪」ツつ古」ツ?ーテッツシツ?3y %% 1 (mod 5) テ」ツ?、テ」ツ?セテ」ツつ?3y %% 1 (mod 5)テ」ツ?ォテ」ツ?ェテ」ツつ凝ッツシツ?
    // x = (1 - 13y) / 5 + 13 (+13テ」ツ?ッテヲツュツ」テ」ツ?ォテ」ツ?療」ツ?淌」ツ??」ツ?凝」ツつ?テ」ツ?ェテ」ツ?ョテ」ツ?ァテッツシツ古」ツ?禿」ツ??」ツ??」ツ??テ」ツ?古」ツ?サテ」ツ?療」ツ??」ツ?古ッツシツ?
    // テ・ツ?暗」ツ?サテ」ツ?ゥテ」ツ?ョ 3y %% 1 (mod 5) ティツァツ」テ」ツ?妥」ツ?ーティツ可ッテ」ツ??ッツシツ偲」ツ?禿」ツつ古」ツ?ッテ」ツ?、テ」ツ?セテ」ツつ甘ッツシツ景nv(13%5, 5) テ」ツ?ァテ」ツ?づ」ツつ凝ッツシツ?
    // テ」ツつ?」ツ?暗」ツ?ォテッツシツ警 = (1 - 13*inv(13%5, 5))/5 + 13 テ」ツ?ィテ」ツ?ェテ」ツつ凝ッツシツ?
    static typename std::enable_if<IsPrime, ll>::type inv(ll a, ll p) {
        return (a == 1 ? 1 : (1 - p*inv(p%a, a))/a + p);
    }
};

template <int M, bool IsPrime>
modulo<M, IsPrime> operator+(modulo<M, IsPrime> lhs, modulo<M, IsPrime> const& rhs) {
    lhs += rhs;
    return lhs;
}
template <int M, bool IsPrime>
modulo<M, IsPrime> operator-(modulo<M, IsPrime> lhs, modulo<M, IsPrime> const& rhs) {
    lhs -= rhs;
    return lhs;
}
template <int M, bool IsPrime>
modulo<M, IsPrime> operator*(modulo<M, IsPrime> lhs, modulo<M, IsPrime> const& rhs) {
    lhs *= rhs;
    return lhs;
}

// sw == false -> inv
template <int M>
modulo<M, true> fact(int n, bool sw = true) {
    static std::vector<modulo<M, true>> v1 = {1}, v2 = {1};
    if(n >= (int)v1.size()) {
        const int from = v1.size(), to = n + 1024;
        v1.reserve(to);
        v2.reserve(to);
        for(int i=from; i<to; ++i) {
            v1.push_back(v1.back() * modulo<M, true>(i));
            v2.push_back(v2.back() / modulo<M, true>(i));
        }
    }
    return sw ? v1[n] : v2[n];
}

template <int M>
modulo<M, true> comb(int a, int b) {
    if(b < 0 || b > a) {
        return fact<M>(0);
    }
    return fact<M>(a, true) * fact<M>(b, false) * fact<M>(a-b, false);
}


const int MOD = 1000000007;
using mod = modulo<MOD, true>;
using ll = long long;

int main() {
    int n, t;
    cin >> n >> t;
    vector<int> v(n);
    for(int i=0; i<n; ++i) {
        cin >> v[i];
    }
    sort(v.begin(), v.end());
    vector<mod> ans(n);
    ans[0] = mod(1);
    for(int i=1; i<n; ++i) {
        int tmp = lower_bound(v.begin(), v.end(), v[i]-t) - v.begin();
        ans[i] = ans[i-1] * mod(i-tmp+1);
    }
    cout << ll(ans[n-1]) << endl;
}
