def solve(board):
    i = 0
    if(board[0][1] == 0):
        check = 0
    else:
        check = 1
    if(len(board) % 2 == 0):
        while(i < len(board)):
            if board[i][i] != (1 - check) or board[i][len(board) - 1 - i] != check:
                return 'No'
            i += 1
    else:
        while(i < len(board)):
            if board[i][i] != (1 - check) or board[i][len(board)-1-i] != (1 - check):
                return 'No'
            i += 1    
    i = 0
    while(i < len(board)-1):
        if(board[i][i+1] != check or board[i+1][i] != check):
            return 'No'
        i += 1
    return 'Yes'