I=input
O='1'
for t in range(int(I())):
	N,S,f=I(),I(),0
	T=[[S,i][S[0]>O][0:1]+[S,i][S[1]>O][1:2]for i in ["00","01","10","11"]]
	for t in T:
		a=b=c=d=1
		for s in t+S[2:]+t:
			if s>O:a,b,c,d=c,a+c,b+d,b
			elif s<O:a,b,c,d=c,0,b+d,0
			else:a,b,c,d=0,a+c,0,b
		f+=a+b+c+d
	print(["No","Yes"][f>0])