N = int(input())
A = [input() for _ in range(N)]

all = 0
for i in range(N):
    for j in range(N):
        if(A[i][j] == "#"):
            all += 1

count = 0
for i in range(N):
    for j in range(N//2):
        if(A[i][j] == "#"):count += 1

print("Yes" if count*2 == all else "No")