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