DB<2> x \%data
0  HASH(0x555e18bb11b8)
   'A' => HASH(0x555e184f6448)
      'B' => HASH(0x555e18bb1218)
         'C' => ARRAY(0x555e18bb1290)
            0  0
            1  1
      'X' => ARRAY(0x555e18bb1278)
         0  5
  DB<3>