a=int(input())
for i in range(a):
	c=int(input())
	d=list(map(int,input().split()))
	n=False
	for j in range(c):
		if not(d[5*j]!=d[5*j+1] and d[5*j]==d[5*j+2] and d[5*j+1]==d[5*j+3]==d[5*j+4]):
			print('No')
			n=True
			break
	if n==False:
		print('Yes')