0  HASH(0x60025cbb8)
   1 => ARRAY(0x60006f210)
      0  'a'
   2 => ARRAY(0x600462490)
      0  'b'
      1  'd'
   3 => ARRAY(0x60048d1b8)
      0  'c'
      1  'f'
   5 => ARRAY(0x600495808)
      0  'e'