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#include "bits/stdc++.h"

#define all(v) (v).begin(), (v).end()
#define st first
#define nd second
#define pb push_back
#define printv(a) { for(auto u : a) cout<<u<<" "; cout<<"\n"; }
#define debug(x) cerr << #x << " = " << x << '\n';

using namespace std;
using ll = long long;
using pii = pair<int,int>;
using vi = vector<int>;
using si = set<int>;
using mii = map<int,int>;



int main(){
    ios_base::sync_with_stdio(0);
    cin.tie(0);
    int t;
    cin>>t;
    vector<string> v;
    v.pb("a");
    v.pb("AP");
    v.pb("AAPP");
    v.pb("AAAPAPPP");
    v.pb("PAPPAA");

    while(t--){
        int n,k;
        cin>>n>>k;
        if(k <= 3){
            if(n > v[k].size()){
                cout<<"NIE"<<'\n';
            }else{
                for(int i=0;i<n;i++){
                    cout<<v[k][i];
                }
                cout<<'\n';
            }
        }else{
            for(int i=0;i<k;i++){
                cout<<'A';
            }
            for(int i=0;i<n-k;i++){
                cout<<v[4][i % 6];
            }
            cout<<'\n';
        }
    }
    return 0;
}