ll@t;
rep(t){
	ll@n;
	ll a=0;
	ll b=3d5;
	rep(n){
		string@x,@y;
		if(x=="a"){
			a>?=y.size();
			if(find(y.begin(),y.end(),'a')!=y.end()){
				b=0;
			}
		}
		if(find(x.begin(),x.end(),'a')==x.end()){
			b<?=x.size();
		}
	}
	wt(a>=b?"Yes":"No");
}