ll@T;REP(T){ll@N,L=0,b=0;string@W[N][2];rep[W](w,N)if(*w=="a"){L>?=T=w[1].size();rep(i,T)b|=w[1][i]<98;}rep[W](w,N)T=w->size(),b|=T<=L&&AND[i,0,T](w[0][i]>97);wt(b?"Yes":"No");}