//Copyright(c)2016 liuchenrui
#include<cstring>
#include<cstdio>
#include<algorithm>
#include<iostream>
using namespace std;
inline void splay(int &v){
    v=0;char c=0;int p=1;
    while(c<'0' || c>'9'){if(c=='-')p=-1;c=getchar();}
    while(c>='0' && c<='9'){v=(v<<3)+(v<<1)+c-'0';c=getchar();}
    v*=p;
}
#define LL long long
int s[4005];
int main(){
    LL T;cin>>T;
    while(T--){
        LL n,m;cin>>n>>m;
        LL k=1;
        for(int i=1;i<=n;i++)k*=3;
        m%=k;
        for(int i=n;i>=1;i--){
            s[i]=m%3;m/=3;
        }
        for(int i=1;i<=n;i++){
            if(s[i]==0)printf("R");
            if(s[i]==1)printf("G");
            if(s[i]==2)printf("B");
        }
        puts("");
    }
}