#include<bits/stdc++.h>
using namespace std;
#define cs const
#define re register
#define pb push_back
#define pii pair<int,int>
#define ll long long
#define y1 shinkle
#define fi first
#define se second
#define bg begin
namespace IO{
#define gc getchar
inline int read(){
    char ch=gc();
    int res=0;bool f=1;
    while(!isdigit(ch))f^=ch=='-',ch=gc();
    while(isdigit(ch))res=(res*10)+(ch^48),ch=gc();
    return f?res:-res;
}
inline ll readll(){
    char ch=gc();
    ll res=0;bool f=1;
    while(!isdigit(ch))f^=ch=='-',ch=gc();
    while(isdigit(ch))res=(res*10)+(ch^48),ch=gc();
    return f?res:-res;
}
inline char readchar(){
	char ch=gc();
	while(isspace(ch))ch=gc();
	return ch;
}
inline int readstring(char *s){
	int top=0;char ch=gc();
	while(isspace(ch))ch=gc();
	while(!isspace(ch)&&ch!=EOF)s[++top]=ch,ch=gc();
	s[top+1]='\0';return top;
}

}
using IO::read;
using IO::readll;
using IO::readchar;
using IO::readstring;
template<typename tp>inline void chemx(tp &a,tp b){(a<b)?(a=b):0;}
template<typename tp>inline void chemn(tp &a,tp b){(a>b)?(a=b):0;}
cs int mod=1e9+7;
inline int add(int a,int b){return (a+b)>=mod?(a+b-mod):(a+b);}
inline int dec(int a,int b){return (a<b)?(a-b+mod):(a-b);}
inline int mul(int a,int b){static ll r;r=(ll)a*b;return (r>=mod)?(r%mod):r;}
inline void Add(int &a,int b){a=(a+b)>=mod?(a+b-mod):(a+b);}
inline void Dec(int &a,int b){a=(a<b)?(a-b+mod):(a-b);}
inline void Mul(int &a,int b){static ll r;r=(ll)a*b;a=(r>=mod)?(r%mod):r;}
inline int ksm(int a,int b,int res=1){for(;b;b>>=1,Mul(a,a))(b&1)&&(Mul(res,a),1);return res;}
inline int Inv(int x){return ksm(x,mod-2);}
inline int fix(ll x){x%=mod;return (x<0)?x+mod:x;}
cs int N=300005,M=400005;
int adj[N],nxt[M<<1],to[M<<1],ecnt;
int n,m;
int K;
int pre[N],bel[N],cnt,up[N];
vector<int> nd[N];
int f[N];
int ff[N],g[N][2];
int vis[N];
void dp(int u,int fa){
 //   cout<<u<<'\n';
    f[u]=1;
    if(!bel[u]){
        for(int e=adj[u],v;e;e=nxt[e])if((e^1)!=fa){
            v=to[e];
            dp(v,e);
            Mul(f[u],mul(f[v],K-1));
        }
    }
    else{
        int tp=bel[u];
        assert(u==up[tp]);
        for(int i=0;i<nd[tp].size();i++){
            int v=nd[tp][i];f[v]=1;
            for(int e=adj[v];e;e=nxt[e])if(bel[to[e]]!=bel[v]&&(e^1)!=fa){
                dp(to[e],e);
                Mul(f[v],mul(f[to[e]],K-1));
            }
            ff[i]=f[v];
        }
        g[0][0]=ff[0];
        g[0][1]=0;
        for(int i=1;i<nd[tp].size();i++){
            g[i][0]=mul(ff[i],g[i-1][1]);
            g[i][1]=mul(ff[i],add(mul(K-1,g[i-1][0]),mul(K-2,g[i-1][1])));
        }
        f[u]=g[nd[tp].size()-1][1];
    }
}
void dfs1(int u,int fa){
    vis[u]=1;
    for(int e=adj[u],v;e;e=nxt[e])if((e^1)!=fa){
        v=to[e];
    //    if(bel[u]&&bel[u]==bel[v])continue;
        if(vis[v]){
            if(bel[v])continue;
            cnt++;
            up[cnt]=v;
            int p=u;
            while(p!=v){
                bel[p]=cnt;
                nd[cnt].pb(p);
                p=pre[p];
            }
            bel[v]=cnt;
            nd[cnt].pb(v);
            reverse(nd[cnt].bg(),nd[cnt].end());
        }
        else{
            pre[v]=u,dfs1(v,e);
        }
    }
}
void solve(){
    ecnt=1;

    n=read(),m=read(),K=read();
    for(int i=1;i<=m;i++){
        int u=read(),v=read();
        nxt[++ecnt]=adj[u],adj[u]=ecnt,to[ecnt]=v;
        nxt[++ecnt]=adj[v],adj[v]=ecnt,to[ecnt]=u;
    }
    dfs1(1,0);
  //  for(int i=1;i<=n;i++)cout<<bel[i]<<" ";puts("");
  //  cout<<"ok1\n";
    dp(1,0);
    cout<<mul(f[1],K)<<'\n';
    memset(adj,0,sizeof(int)*(n+1));
    memset(f,0,sizeof(int)*(n+1));
    memset(vis,0,sizeof(int)*(n+1));
    memset(bel,0,sizeof(int)*(n+1));
    memset(pre,0,sizeof(int)*(n+1));
    memset(up,0,sizeof(int)*(n+1));
    for(int i=1;i<=cnt;i++)nd[i].clear();
    cnt=0;
    return;
}
int main(){
	//freopen("1.in","r",stdin);
    int T=read();
    while(T--)solve();
    return 0;
}