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

tmp = []

for i in range(N):
    for j in range(N):
        if G[i][j] == "#":
            tmp.append([i,j])

for i in range(N):
    for j in range(N):
        if G[i][j] == "#" and G[i][N-j-1] == ".":
            a,b = tmp.pop()
            if i*N + j < a*N + b:
                G[i][N-j-1] = "#"
                G[a][b] = "."
            else:
                print("No")
                exit()
print("Yes")