#pragma GCC optimize("Ofast")
#pragma GCC target("avx2")

#define rd_init() char*rp=({char*mmap();mmap(0l,1l<<25,1,2,0,0ll);})
#define rd() ({int _v=0,_c;while(_c=*rp++-48,_c>=0)_v=_v*10+_c;_v;})

char wbuf[1<<25];

int main(){
	char*wp=wbuf;
	rd_init();
	int t=rd();
	while(t--){
		int n=rd();
		int first=0,last=0,good=1;
		while(n--){
			int c=*rp; rp+=2;
			if(!(c&1)){
				if(last==c){
					good=0;
				}
				last=c;
				if(!first){
					first=c;
				}
			}
		}
		if(first==last){
			good=0;
		}
		if(good){
			*wp++='Y';
			*wp++='e';
			*wp++='s';
		}else{
			*wp++='N';
			*wp++='o';
		}
		*wp++='\n';
	}
	write(1,wbuf,wp-wbuf);
	_exit(0);
}