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# array mapping PPN to hash of info key => value
#  element keys:
#   LPN => logical page number stored at this block
#   XPPN => array of unknown numbers found with this block
my @PPN = ();

# array mapping LPN to array of PPNs that store copies
#  each element is an array of PPNs
my @LPN = ();

use constant NAND_PAGE_SIZE => 16384;  # or whatever...
{
...
  }
  close IMAGE;
}