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

cnt = 0
for i in range(N):
    for j in range(N//2): # 奇数の場合、真ん中の列はチェックしない
        if A[i][j] != A[i][N - 1 - j]:
            cnt += 1

if cnt%2 == 0:
    print('Yes')
else:
    print('No')