C11111333133313232233133313331333131123313221211113313231232211   >>    C1111133313331323223313331333133313112331322121111331323123221   <<    C11111333133313232233133313331333131123313221211113313231232213   >>      C11111333133313232233133313331333131123313221211113313231232212   >>