Largest Square

T=input()
for t in range(int(T)):
	x,y,TT=map(int, input().split())
	print(x,y,TT)
	arr=[]
	arr.append([0 for i in range(y+2)])
	for i in range(x):
		tmp=[]
		tmp+=list(input())
		tmp.append('0')
		tmp.insert(0,'0')
		arr.append(tmp)
	arr.append([0 for i in range(y+2)])
	for tt in range(TT):
		a,b=map(int, input().split())
		a=a+1
		b=b+1
		count=1
		p=0
		for i in range(1,100):
			for j in range(a-i,a+i+1):
				for k in range(b-i,b+i+1):
				#	print(j,k)
					if arr[a][b]!=arr[j][k]:
						p=1
			if p==1:
				break
			count+=2
		print(count)