#include <bits/stdc++.h>
#include <ext/pb_ds/assoc_container.hpp>
#pragma GCC target("avx,avx2,fma")
#pragma GCC optimize("Ofast,unroll-loops")
using namespace std;
using namespace __gnu_pbds;
#define pb push_back
#define all(x) x.begin(),x.end()
#define rall(x) x.rbegin(),x.rend()
#define f first
#define s second
#define int long long
#define ll long long
#define pii pair<int,int>
#define ar array
#define mps make_pair
template<class T>bool umax(T &a,T b){if(a<b){a=b;return true;}return false;}
template<class T>bool umin(T &a,T b){if(b<a){a=b;return true;}return false;}
template<class T> using ste = tree<T, null_type, less_equal<T>,
rb_tree_tag, tree_order_statistics_node_update>;
const int inf = 3e18 + 7;
const int mod = 1e9 + 7;
const int N = 2e5 + 5;
const int md = 998244353;
int binpow(int a, int b, int m){
if(b == 0)return 1;
if(b % 2 == 0){
int c = binpow(a,b/2,m);
return (c*c)%m;
}
return (binpow(a,b-1,m)*a)%m;
}
int divi(int a, int b, int m){
return (a*(binpow(b,m-2, m)))%m;
}
int n,m,k,q;
vector<int>g[21];
void solve(){
cin >> n >> k;
vector<int>v(n);
for(auto &to:v)cin >> to;
int dp[(1<<n)][n]{};
for(int i = 0;i<n;i++){
dp[(1<<i)][i] = 1;
}
for(int mask = 1;mask<(1<<n);mask++){
vector<pii>vs;
for(int i = 0;i<n;i++){
if(dp[mask][i] > 0)vs.pb({v[i], dp[mask][i]});
}
sort(all(vs));
vector<int>pref(vs.size());
for(int i = 0;i<vs.size();i++){
pref[i] = ((i == 0) ? 0 : pref[i-1]);
pref[i] += vs[i].s;
pref[i] %= mod;
}
for(int i = 0;i<n;i++){
if(mask >> i & 1)continue;
if(v[i] - vs[vs.size()-1].f > k)continue;
int l = 0, r = vs.size(), ans = -1;
while(l <= r){
int mid = (l+r)/2;
if(v[i]-vs[mid].f <= k){
ans = mid;
r = mid - 1;
}
else l = mid + 1;
}
int n_mask = (mask | (1<<i));
dp[n_mask][i] += pref[vs.size()-1] - ((ans == 0) ? 0 : pref[ans-1]);
dp[n_mask][i] %= mod;
}
}
int res = 0;
for(int i = 0;i<n;i++){
res += dp[(1<<n)-1][i];
res %= mod;
}
cout << res << "\n";
}
/*
*/
signed main()
{
// freopen("seq.in", "r", stdin);
// freopen("seq.out", "w", stdout);
ios_base::sync_with_stdio(0);cin.tie(NULL);cout.tie(NULL);
int tt=1;//cin>>tt;
while(tt--)solve();
}
