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#include "bits/stdc++.h"
using namespace std;
#define ll long long
#define ff first
#define ss second


int main()
{
    ios_base::sync_with_stdio(0); cin.tie(0);

    int t; cin>>t;

    while(t--)
    {
        int n,k; cin>>n>>k;

        if(k<20 && n>(1<<k))    {cout<<"NIE"<<'\n'; continue;}
        if(k==1)
        {
            if(n==1)    cout<<"A"<<'\n';
            else    cout<<"AP"<<'\n';
            continue;
        }


        //cout<<"XDDD"<<endl;

        string ans;
        int start=min(n,k);
        for(int i=0; i<start; i++) ans.push_back('A');

        int ile;
        if(k<=19) ile=(1<<(k-2))-1;
        else ile=n;

        //cout<<"XDDD"<<endl;
        char akt='P';
        for(int i=1; i<=ile && (int)ans.size()<n; i++)
        {
            int sajz=1+__builtin_ctz(i);
            for(int j=0; j<2 && (int)ans.size()<n; j++)
            {
                int trza=min(sajz, (int)(n-ans.size()));
                ans.append(trza,akt);
                //cout<<"XDDD"<<endl;
                if(akt=='P') akt='A';
                else akt='P';
            }
        }
        //cout<<"XDDD"<<endl;
        while((int)ans.size()<n) ans.push_back('P');
        //cout<<"XDDD"<<endl;
        cout<<ans<<'\n';
    }

}