C11111333133313232233133313331333131123313221211113313133313232212321231   >>    C1111133313331323223313331333133313112331322121111331313331323221232123   <<    C11111333133313232233133313331333131123313221211113313133313232212321233   >>      C11111333133313232233133313331333131123313221211113313133313232212321232   >>