N = int(input())
G = []
for i in range(N):
    A = list(input())
    G.append(A)

cnt1 = 0
for i in range(N):
    for j in range(N):
        if G[i][j] != G[i][N-j-1]:
            if G[i][j] == "#":
                cnt1 += 1

if cnt1 % 2 == 0:
    print("Yes")
else:
    print("No")