#include<bits/stdc++.h>
#define int long long
using namespace std;
#define fi first
#define se second
#define rep(i,a,b) for(int i=(a);i<=(b);i++)
#define per(i,a,b) for(int i=(a);i>=(b);i--)
#define eb emplace_back
#define y1 yylyylyylyyl
typedef pair<int,int> pii;
typedef vector<int> vi;
typedef vector<pii> vp;
typedef unsigned long long ull;
typedef __int128 lll;
 
long long read() {
    long long res=0, w=1; char c=getchar();
    while(!isdigit(c)) {if(c=='-') w=-1; c=getchar();}
    while(isdigit(c)) {res=res*10+c-48, c=getchar();}
    return res*w;
}

int T,n,m;

signed main() {
    T=read();
    rep(t,1,T) {
        n=read(), m=read();
        vector<int>c;
        rep(k,1,n/2) {
            c.eb(n); n--;
            int x=k+1, y=k;
            rep(j,1,n/2) {
                c.eb(x), c.eb(y);
                y--, x++;
                if(y==0) y=n;
                if(x==n+1) x=1;
            }
            n++;
        }
        c.eb(n);
        int pos=0;
        printf("Case #%lld:\n",t);
        rep(i,1,m) {
            int l=read()+1;
            while(l--) printf("%lld ",c[pos++]);
            puts(""); pos--;
        }
    }
    return 0;
}