n = gets.to_i
if n.odd?
  puts 'Yes'
  exit
end
as = n.times.map { gets.chomp.chars }
d = 0
as.each do |row|
  row.zip(row.reverse).each { d += 1 if _1 != _2 }
end
puts (d / 2).even? ? 'Yes' : 'No'