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] == "#":
            if i*N+j != i*N + (N-j-1):
                tmp.append([i,j])

for i in range(N):
    for j in range(N):
        if G[i][j] != G[i][N-j-1]:
            if len(tmp):
                a,b = tmp.pop()
            else:
                print("No")
                exit()

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