C1111233133313231133133313331333131211111331121211113313233312131   >>    C111123313331323113313331333133313121111133112121111331323331213   <<    C1111233133313231133133313331333131211111331121211113313233312133   >>      C1111233133313231133133313331333131211111331121211113313233312132   >>