C1111233133313231133133313331333131211111331121211113313233232212131   >>    C111123313331323113313331333133313121111133112121111331323323221213   <<    C1111233133313231133133313331333131211111331121211113313233232212133   >>      C1111233133313231133133313331333131211111331121211113313233232212132   >>