#include<bits/stdc++.h> using namespace std; int t,lena,lenb,flag; char a[100005],b[25]; int main(){ cin>>t; while(t--){ flag=0; cin>>a>>b; lena=strlen(a),lenb=strlen(b); if(lena%lenb){ cout<<"NO\n"; continue; } for(int i=0;i<lena;i+=lenb) for(int j=0;j<lenb;j++) if(a[i+j]!=b[j])flag=1; if(flag)cout<<"NO\n"; else cout<<"YES\n"; } }